chore(travis): temporary disable IE & Safari when running tests on travis

Closes #1464

Author: vsavkin

.travis.yml

@@ -19,21 +19,21 @@ env:
   - JOB=unit-stable
     CHANNEL=stable
     TESTS=dart2js
-    BROWSERS=SL_Chrome,SL_Firefox,SL_IE10,SL_IE11,SL_Safari6,SL_Safari7
+    BROWSERS=SL_Chrome,SL_Firefox
   - JOB=unit-dev
     CHANNEL=dev
     TESTS=dart2js
-    BROWSERS=SL_Chrome,SL_Firefox,SL_IE10,SL_IE11,SL_Safari6,SL_Safari7
+    BROWSERS=SL_Chrome,SL_Firefox
   - JOB=e2e-g3stable
     CHANNEL=stable
-    BROWSERS=DartiumWithWebPlatform,SL_Chrome,SL_Firefox,SL_IE10,SL_IE11,SL_Safari6,SL_Safari7
+    BROWSERS=DartiumWithWebPlatform,SL_Chrome
     USE_G3=YES
   - JOB=e2e-stable
     CHANNEL=stable
-    BROWSERS=DartiumWithWebPlatform,SL_Chrome,SL_Firefox,SL_IE10,SL_IE11,SL_Safari6,SL_Safari7
+    BROWSERS=DartiumWithWebPlatform,SL_Chrome
   - JOB=e2e-dev
     CHANNEL=dev
-    BROWSERS=DartiumWithWebPlatform,SL_Chrome,SL_Firefox,SL_IE10,SL_IE11,SL_Safari6,SL_Safari7
+    BROWSERS=DartiumWithWebPlatform,SL_Chrome
   global:
   - secure: AKoqpZ699egF0i4uT/FQ5b4jIc0h+KVbhtVCql0uFxwFIl2HjOYgDayrUCAf6USfpW0LghZxJJhBamWOl/505eNSe9HvEd8JLg/to+1Fo9xi9llsu5ehmNH31/5pue4EvsrVuEap1qqL6/BNwI2cAryayU0p5tV0g8gL5h4IxG8=
   - LOGS_DIR=/tmp/angular-build/logs