Merge pull request #777 from lucianobaraglia/master

Changed label for gii generated form [skip ci]
fixed output of classMap controller
re-added Exception about wrong class name to autoloader

helps reducing weird error messages.
exclude gii from classmap
sort classmap alphabetically

to avoid producing different results on different file systems
-> better diffs
finished module code generator.
Merge branch 'master' of github.com:yiisoft/yii2
NavBar updated to reflect bootstrap v3 changes. Logo is now visible when viewed via mobile.
Gii: minor JS fixes
Gii: fixed logo position in mobile mode, cleanup
Gii: compressed logo image
Gii: use composer instead of including diff library directly
composer config update.
fixed composer.json
Fixed yii autoload precedence.
Added StringHelper::diff().
Replaced diff vendor.