Merge pull request #11 from muya/master

Added latest db schema
Merge pull request #12 from muya/master

Completed API implementation of delete action
Merge pull request #13 from muya/master

Completed Modification of Gii Generator to work with our project
Merge pull request #15 from muya/master

Merging completed modifications on Gii generators
Merge pull request #16 from muya/master

Added Groups Module
Merge pull request #17 from muya/master

Added groups to top navbar
Merge pull request #18 from muya/master

added the correct lates db
Error Page and UI

Custom error page and Slide show in the frontend
added latest changes
did some css changes
latest changes