Fixed not loading the module specific css (css file is in lowercase)
Cleanup several duplicate css & Css folder (TODO: check mailmotor)
Cleanup some more duplicate css & Css folder
Fixed loading installer specific css (must be lowercase)
Fixed some incorrect path names in the installer
Fixed some incorrect path names in the installer (must be lowercase)
Merge pull request #700 from bart-lysander/3.7-wip

3.7 wip