Converting our backend to Go using Google Appengine. This commit includes the Hello World example from Appengine's tutorials.
Adding the Hello World tutorial from AppEngine
New experimental Go APIs to:
    . Retrieve the list of nicknames a user uses
    . Add/Modify a nickname a user gave to someone
Implementing in Go the 3 APIs the django app currently supports:
    . Get Nicknames
    . Add Nickname
    . Get Suggestions
Chrome extension integrated with Go APIs
(nit) parsing authorId and targetId to float before sending the request)
Updating base service address from local to current app address
(nit) changing app error messages to match appengine's defaults
Changing the regex that matches request URIs, there might be a better way
to do this, but I'll leave it as it is for now.
(nit) getting the appengine context at the beggining of the handlers
Go APIs ready and integrated with extension.

	. Adding json tags to AddNicknameContract
	. Removing Hex encode/decode
	. Ids now treated as strings
	. (Fix) nickname button only working after first try
Merging previously created SendNicknameParameters with the
AddNicknameContract. Using the one from requestparameter and avoiding
creation of redundant object.
Code seems to be working, not switching to Go server on master yet while we haven't
transfered the database though (I have so many nicknames already :( )