Remove support for Python 2.6 and 3.3

This is just matching Pandas 0.18.

pandas-dev/pandas#7718
pandas-dev/pandas#11273

Author: martijnvermaat

.travis.yml

@@ -3,9 +3,7 @@ language: python
 sudo: false
 cache: pip
 python:
-  - "2.6"
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
 install:

setup.py

@@ -44,10 +44,8 @@
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Topic :: Scientific/Engineering']