Edited parts of schema

Schema changed to accommodate discussed changes on Module and UserGroup
relationship.

Also,

1. added cleanup method inside UploadModule servlet.
2. Added code for delete module (yet to test)
3. Added code for edit module (yet to test)
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/java/org/smu/servlets/uploadModule.java
	src/java/org/smu/sis/ModuleDataManager.java
upload module conflict removed
Conflict Removed

src/java/org/smu/servlets/uploadModule.java
src/java/org/smu/sis/ModuleDataManager.java
Merge branch 'master' of https://github.com/pujaraaniket2012/smusisbp

Conflicts:
	.gitignore
	src/java/org/smu/servlets/uploadModule.java
	src/java/org/smu/sis/ModuleDataManager.java