iOS Login Implemented

Successfully implemented username/ password authentication between iOS
app and web server using POST requests and JSON response. Also edited
some navigation stuff and added alert views.

In the process of changing book uploads from GET to POST.
Merge branch 'master' of https://github.com/noah-mulfinger/claremont-books

Conflicts:
	ClaremontBooks/ClaremontBooks/Main.storyboard
test
Merge branch 'master' of https://github.com/noah-mulfinger/claremont-books