Refactored HTTP GET parameters

Added "gid" HTTP param to /fetch route. This parameter may be used to
specify the Google User ID.
Fixes in results caching

Previously results were cached by profile name. This introduced a bug
where last cached results would be returned even if users change the
maxResults parameter passed to the service. Now the results will be cached
using a key = profile + maxResults.

This fixes the bug but may increase number of requests being sent over the
service to the G+ API.
Default maxResults set to 10
Added analytics tracker
Bumped version