refactor trip form js out of haml file
refactor trip form js out of haml part 2

* simple validation on input fields for from and to locations
style for next button disabled stated
updated style for stop class, but Dines should technically have the official last say
Merge branch 'cgdevelop' into fix-57-next-button-validation
fixed double click-event on edit trip
fix double click-event issue when doing multiple trip edits
Merge pull request #16 from CG-CamSys/fix-57-next-button-validation

Fix 57 next button validation