Update to make files
Merge pull request #135 from nuams/dkan_makefiles_change

Update to make files
adding slack integration for travis
adding multi channel notifications for dkan
Adding key to drupal core to play nice with buildmanager
Adding information about google group
Update .travis.yml
Changed 'The goal of the project combine...' to 'The goal of the project is to combine...'
Merge pull request #158 from fureigh/7.x-1.x

Typo fix: Changed '...combine' to '...is to combine'
Issue nuams/dkan#121: Fix travis build