added column to save the google analytics tracking code into channel
only admin users can set the GA Code into channel profile/edit
create a analytics helpers to handler with methods that render the analytics scripts
use analytics helpers instead direct render
whitespace into channel/posts title
Merge branch 'master' into feature/add_ga_code_into_channels

* master:
  change header channel link to how it work
  hide send project button on channels [13734555]
  fix financials view expires_at
  use same db function to get project expires_at
remove mixpanel from this partial
Merge pull request #800 from devton/feature/add_ga_code_into_channels

Added Google Analytics Code field into channel