Added admin API functionality
Follow-up on review
Added extra API functionality
Merged with bert's coverageUpload branch
Added unit-tests for apis
Merged with latest master
Fixed bug in userAPI
Follow-up on review

- Removed `drop database` command from Travis file
- Changed `@api private` to `@private`
- Added validation for callback functions
- Added unit tests for callback functions
- Fixed typo’s
Merge pull request #11 from Coenego/apis

Added API functionality
Merge branch 'master' of https://github.com/CUL-DigitalServices/grasshopper-ui into adminLogin
Add local login and logout to the header, create utility function to render templates, render header as a template