Create position rake task

* Creates migration to drop position table
* Creates migration to add column position to users
* Updates db schema
Create position rake task

* Remove relationship between users and positions
* Updates views with the proper methods
* Updates bamboo sync method to get the proper information
Create position rake task

* Removes position model
* Removes position model specs
* Updates user model specs
Create position rake task

* Updates shared user views
* Removes input for position in edit user view
Create position rake task

* Removes position fabricator
Create position rake task

* Fix bamboo specs
* remove last position_name method in views
Merge pull request #59 from crowdint/chore/create-positions-rake-task

Add positions to rake task