Law School - Contextual Transcript Link

Added angular function to academicsController to check if user is a Law student. Changed transcript link from hard-coded link to angular variable that gets set to different link if user is a Law student.
@greytoyota Can't we replace this & the following lines with:

```
return collegeAndLevel.colleges[0].college === 'School of Law'
```

Since that way it should also return true when the student's only college is law.