moves all files to concerns to align with rails 4 convension.

* this also now allows code reload, instead of requireing to restart foreman each time
* left pulp connection handling, as that needs a seperate PR
move pulp config loader from to a class

Using it as a class instance breaks both intial migrations and does not
take into account changes in settings
Merge pull request #31 from ohadlevy/concerns

moves all files to concerns to align with rails 4 convension.