Added Google stuff

- Added a GoogleManager class with some convenient methods for pushing
rows of data to a spreadsheet online, as well as printing them out
- Added a KeyValueList as a convenience wrapper for a
List<KeyValuePair<string,string>>, i.e. a list with key value pairs
which can be duplicate
- Added a DumbSecurityCertificatePolicy to bypass MonoDevelop's security
(TODO: Actually do some kind of certificate checking)
- Added a Plugins folder with the Google Docs API .dll files needed for
the Google Manager
* No actual new functionality is introduced in this commit, it merely
prepares for sending data to google docs