Student/TA Group Management finally added

Hopefully it doesn't break anything.
Modified UI and references
Merge pull request #32 from mabalaski/master

Minor updates to login interface
Merge pull request #30 from Contramalgra/patch-5

Student/TA Group Management finally added
Merge pull request #31 from itpun/patch-3

Modified UI and references
change to lower case M
Spruced up the Spec file

- Reduced line lengths to ~80 chars
- Changed `Assignment(s)` -> `Activity(ies)`
- Altered a few section names
Tweaked Non-functional Requirements
Rewrote the System Admin UI mockup

Changed the System Admin UI mockup and simplified it to the Create/Modify Account mockup. I also fixed a small typo somewhere
Final tweaks for style - submitting

- Made the margins smaller
- Fixed wording in a few places.
Added minutes of the meeting files