Add TurbotPlugins::UrlHandler.

Currently has special handling for github.com urls.
All other urls simply print the page title.
Requested whitespace fix.
Merge branch 'master' of github.com:rondale-sc/turbot into add_url_handler
Merge branch 'master' of github.com:rondale-sc/turbot into add_url_handler
Merge branch 'master' of github.com:rondale-sc/turbot into add_url_handler
Merge branch 'master' of github.com:rondale-sc/turbot into add_url_handler
Merge branch 'master' of github.com:rondale-sc/turbot into add_url_handler
Merge branch 'master' of github.com:rondale-sc/turbot into add_url_handler
Additional matcher types for url's with tests.
Merge pull request #3 from rjackson/add_url_handler

Add TurbotPlugins::UrlHandler