Merge pull request #59 from theponti/user-associations

User associations
Merge pull request #60 from theponti/develop

Develop
Merge pull request #63 from theponti/ready-for-production

Add travis and heroku files
Add category model
Merge branch 'master' of https://github.com/theponti/backpack
Move watch task to end of default tasks
Merge pull request #64 from theponti/develop

Move watch task to end of default tasks
Add mocha; move test directory
Add test folder
Merge pull request #67 from theponti/add-test-script

Add test script
Remove unique:true for name and add require for user
Merge pull request #69 from theponti/user-associations

Remove unique:true for name and add require for user
Add associations for backpacks, folders, and items
Fixes #65
Merge pull request #70 from theponti/user-associations

User associations
Merge branch 'develop' into ready-for-production