try to fix basic app travis.yml
try to fix basic app travis test.
fixed basic app build
run basic app functional tests within the main repo test chain
enabled acceptance tests for basic application
added classes to grid, list and detail view

to allow specific styling
also fixed an issue with gridview sort indicator css.

fixes #1000
fixed readme
Added --prefer-dist to all docs

1. It results in much smaller download and takes less disk space (25MB instead of 180MB for yii-basic + dependencies).
2. It requires less utilities to be installed (no VCS binaries required).
3. It takes less time to install dependencies.
Removed error-block HTML class and related styles and used Bootstrap3 standard practice about errors instead
Merge remote-tracking branch 'yii/master'