Cleans newscoop after upgrade.

 - Removes unused core files
 - Removes google extension
 - Runs assets install
 - Runs composer dump autoload
Removes redundant comment
Added directories to be checked manually.
Adds some more manual directories to check and silences output of assets:install command.
Updates files to remove list.
Fix in typography
Merge pull request #820 from m038/upstream_master

Cleans newscoop after upgrade.