Added content uploading and viewing/downloading.
Any number of contents can now be added to a subscription on the Create page. Contents of a subscription are also shown on the sub's details page.
Merge branch 'master' of https://github.com/bgoerdt/fse-subcription-app into upload-content

Conflicts:
	FSE_Subscription_App/FSE_Subscription_App/App_Data/AppDb.mdf
	FSE_Subscription_App/FSE_Subscription_App/App_Data/AppDb_log.ldf
	FSE_Subscription_App/FSE_Subscription_App/Controllers/ContentController.cs
Merge pull request #5 from bgoerdt/upload-content

Upload content