Added api docs building for 3.0
Merge pull request #10 from ADmad/3.0

Added api docs building for 3.0
Tweaked sidebar display.
Added "3.0" to versions list.
Merge pull request #11 from ADmad/3.0

Tweaked sidebar display.
CSS tweak.
Fix styling on subnamespaces section.
Fix missing trait method names.

Trait methodnames were missing from the API output. However, the links
were correct, so those were left as is..
Merge branch 'master' of github.com:cakephp/cakephp-api-docs
Fixed source directory path for 3.0
Exclude app/Config