use mongoose for db connection

fixes linnovate/mean#711
update init steps to check for grunt
allow for postinstall to be run from contrib packages
Adding a github powered cla - hatstip to @ellman for the idea
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Merge pull request #1 from linnovate/master

Merging in master
Merge pull request #2 from thomastaylor312/moduleIssue

Module issue
Merge pull request #4 from thomastaylor312/master

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