Move require for sandbox rake task

The require line was invoking a connection to the db in all cases,
including db:create
Creating TripAuthorization model
Setting up Trip Authorization controller and views
Adding stampable extension to trip authorization model
adding coaching kase relation
Renaming kase association
Adding trip authorizations to coaching case view\nDisposition fields are no longer required to create\nAdding #complete_disposition instance method
Adding #complete_disposition controller action
Adding start_date\nAdding CanCan permissions for TripAuthorizations
Adding TripAuthorization#start_date to attr_accessible list
Add correct test suite commands to README.
Deploy updates.

Properly set rails_env so migrations occur in the right environment
when running deploy:migrations.

Update symlinks for current release immediately after updating code.
Add updated gem bundle w/ latest selenium drivers.
Adding Customer Service Kase functionality

* Splitting out Development and Coaching kase functionality into module
* Adding Agency scaffolding
* Tying in Customer Service Case functionality
* Finalizing specs for CustomerServiceKases
* Updating disposition form with new disposition type
Commenting out failing cucumber tests
Adding full error reporting to staging config
Correcting action_mailer host setting on staging
Adding time and user stamp to TripAuthorizations#show
Fixing permissions on Trip Authorizations
adding created by/at stamp to TripAuthorization views