Issue #10: Implemented CookieStore for persistant storage of session cookies.

Persistant stoage of cookies are made avaliable through the CookieStore singleton, and changes made to facilitate this transition were made.
Issue #10: Implemented CookieStore for persistant storage of session cookies.

Persistant stoage of cookies are made avaliable through the CookieStore singleton, and changes made to facilitate this transition were made.
Issue #10: Flush functionality and caching added to CookieStore.

The CookieStore now caches the cookie string to memory instead of reading from disk through a SharedPreference each time. The store can also now be flushed, removing both the cached copy from memorgy and the Preference key-value pair on disk.
Merge branch 'new/cookiestore' of github.com:hpxro7/UWSchedule into new/cookiestore
Merge pull request #16 from hpxro7/new/cookiestore

Issue #10 - Implement UW CookieStore