Added manual data sync button

The admin user can now initiate a data update for an individual post
from the reporting dashboard.
Log metric changes to database

A new database table is created. When social data is updated, the
change is logged to the database.
Code cleanup and removal of unnecessary options

From: https://github.com/google/google-api-php-client
Added Google API PHP library

https://github.com/google/google-api-php-client
Added Google Analytics data sync feature
fixed an issue calculating social aggregate score
Bugfix when network activating plugin

When network activating, the activation hook does not run for every
blog; manually make sure the options are set on each blog.
Maintain one record per day for data changes
Merge branch '1.1.0-improved-dashboard' into development