documentation error

-added javadoc to the SocialUpdateActivityClass
fixed broken button links

-added toast message for "First time and renewal feature" that the
feature does not work.
-fixed link for Health 101 magazine link to launch in browser.
Refactored RSSTaskdetail strings

-refactored strings into an Enum to avoid magic typos for future
development.
Merge pull request #184 from jortiz011235/master

Assignment 1 - Joseph Ortiz