Debug module docs including custom panel example, profiling docs in logging
Removed context section from logging docs
Fixed issue with  preventing  from clearing events and behaviors on clone
Merge pull request #2539 from jom/clone_activequery_fix

ActiveRelationTrait:: __clone() doesn't call parent (Component::__clone())
Fixes #2527: Source language for `app` message category was always `en` no matter which application `sourceLanguage` was used
Increased timeout for scrutinizer code coverage

travis seems to be really slow currently...
Delete .coveralls.yml

No need for it anymore.
phpdoc fixes
fixed arrayHelper::toArray() recursive call

added a missing argument
edited assets guide
added anchors to ApiMarkdown

fixes #2220
Documented "Catching all incoming requests"
Completed events doc
Documented more ways of attaching behaviors
Restructured i18n doc, finished i18n formatter section
test for deeply nested relation

close #2543
refactored apidoc extensions completely.

separated guide and apidoc, better maintainability
Merge branch '2524-formatter-format-file-size' of github.com:VinceG/yii2 into VinceG-2524-formatter-format-file-size

Conflicts:
	framework/CHANGELOG.md
Adjusted code formatting
Fixes #2544: Changed `DetailView`'s `name:format:label` to `attribute:format:label` to match `GridView`