Implemented history function for fetching the shouts within a channel history
Added extension method for stripping whitespaces and line breaks from a string. Necessary when parsing the shoutbox history
Added PremiumUser class derived from User for handling information and methods that are only available for premium users
Implemented function for updating information about the shoutbox (such as the top 10 chatters and the additional info section displayed in the history)
Added parameter to the history function for automatically updating the shoutbox with the same response content
Merge pull request #2 from Mostey/shoutbawks

Shoutbox - History and Update functions