ensure tests run
fix import
added get categories test
allow getting of category by id
add post for category
added put category
allow deleting of categories
fix pep8
refactor file structure
move validators to api
fix import
add travis config
install libgit2
ensure libgit dependencies installed for travis
install libgit in venv
add debug for travis
set env flags for libgit2
almost there..ensure cmake installs
set libgit env for travis
remove unnecessary try block for put