Implement travis CI build

.travis.yml

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+language: python
+python:
+  - "3.6"
+os:
+  - linux
+matrix:
+  include:
+  - env:
+      - NAME= arduinoCI
+      - IDE_VERSION=1.8.5
+    # Use in CI/build/conf/path_config_travis.json
+      - ARDUINO_IDE_PATH=$HOME/IDE/arduino
+    install:
+    # Install Arduino IDE
+      - mkdir -p $ARDUINO_IDE_PATH
+      - wget http://downloads.arduino.cc/arduino-$IDE_VERSION-linux64.tar.xz
+      - tar xf arduino-$IDE_VERSION-linux64.tar.xz --strip-components=1 -C $ARDUINO_IDE_PATH
+      - rm arduino-$IDE_VERSION-linux64.tar.xz
+    # Install STM32 core supported by ST
+      - cd $ARDUINO_IDE_PATH
+        # Add json packages url to the Arduino IDE
+      - ./arduino --save-prefs --pref "boardsmanager.additional.urls=https://github.com/stm32duino/BoardManagerFiles/raw/master/STM32/package_stm_index.json"
+        # Install the latest core version
+      - ./arduino --install-boards STM32:stm32
+      - rm -fr $HOME/.arduino15/packages/STM32/hardware/stm32/*
+        # Replace default core with the one being built
+      - sudo ln -s $TRAVIS_BUILD_DIR $HOME/.arduino15/packages/STM32/hardware/stm32/*
+    before_script:
+      - cd $TRAVIS_BUILD_DIR/CI/build/
+      - cp ./conf/path_config_travis.json ./path_config.json
+    script:
+      - python arduino-builder.py --travis
+    after_failure:
+      - echo " The build is failed. If script return a non-zero return status , we suggest you to take the above logs into consideration. Otherwise, consult the TRAVIS CI documentation to learn more about build failure" 
+notifications:
+  email:
+    on_success: always
+    on_failure: always

CI/build/.flake8

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+[flake8]
+max-line-length = 88

CI/build/README.md

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+# arduino-builder.py
+
+This script manages _[arduino-builder](https://github.com/arduino/arduino-builder)_ command line tool for compiling Arduino sketch(es).
+
+## Requirements
+- [Arduino IDE](https://www.arduino.cc/en/Main/Software) (_[arduino-builder](https://github.com/arduino/arduino-builder)_ is included) 
+- Python version greater than or equal to  3.2 (due to `concurrent.futures` usage)
+
+## Usage
+
+```
+usage: arduino-builder.py [-h] [-l [{board,sketch}] | -a] [-b pattern] [-c]
+                          [--arch architecture]
+                          [--config <core configuration file>] [-v]
+                          [--bin | --travis]
+                          [-i <shetch filepath> | -f <sketches list filepath> | -s pattern | -e <excluded sketches list filepath>]
+
+Manage arduino-builder command line tool for compiling Arduino sketch(es).
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -l [{board,sketch}], --list [{board,sketch}]
+                        list available board(s) or sketch(es)
+  -a, --all             build all sketches found for all available boards
+  -b pattern, --board pattern
+                        pattern to find one or more board(s) to build
+  -c, --clean           clean output directory
+                        <user patch config>/arduinoBuilderOutput
+  --arch architecture   core architecture to build. Default build architecture
+                        is stm32
+  --config <core configuration file>
+                        JSON file containing the build configuration for one
+                        or more maintainer/architecture. Board options for
+                        build, applicability of sketches for boards or
+                        required options. If sketch is not listed then
+                        applicable to all board. Default core configuration is
+                        for 'stm32' architecture in: <user patch config>/arduino-
+                        builder/conf/cores_config.json
+  -v, --verbose         enable arduino-builder verbose mode
+  --bin                 save binaries
+  --travis              Custom configuration for Travis CI build
+
+Sketch(es) options:
+  By default build <user patch config>/arduino/examples/01.Basics/Blink/Blink.ino
+
+  -i <shetch filepath>, --ino <shetch filepath>
+                        single ino file to build
+  -f <sketches list filepath>, --file <sketches list filepath>
+                        file containing list of sketches to build
+  -s pattern, --sketches pattern
+                        pattern to find one or more sketch to build
+  -e <excluded sketches list filepath>, --exclude <excluded sketches list filepath>
+                        file containing pattern of sketches to ignore. Default
+                        path : <user patch config>/arduino-builder/conf/exclude_list.txt
+```
+
+## Cores configuration files
+
+ToDo
+
+## Usage examples
+
+ToDo
+