Fixed links to sections.
Fixes #12.
Added tests environment docs.
Tests Environment guide corrected.
Fixed indentation.
Fixed code style and comment in code sample.
Reviewed tests guide.
The official name is Bender.js.
Shortened the guide name.
Tests guide corrections.
Added possibility to define which config will be used for building documentation.
Clarify finished message in build.sh.
Testing env not tests env.
ACF mentioned in Quick Start Guide.
Code Snippet plugins added to the widget plugins list.
Code comment split to avoid scrollbar.
Styles documentation revised.
Merge branch 'master' into ckeditor-sdk