Refactor config into own module, add tests
Add newline in Makefile
Update basicauth with new config
Add feature to search for closest N instructors

Fixes #3
Merge branch 'sburns-feature/better-config'
Merge branch 'feature/closest-instructors' of github.com:sburns/admintool into sburns-feature/closest-instructors
Merge branch 'sburns-feature/closest-instructors'
added instructions for running tests.
Use a StaticPool for db connection pooling. Fixes #8.
documented environment variables.
moved tests into a new 'tests' directory.
added .travis.yml.
add travis badge to readme.