Add email sending toggle checkbox to assignment forms
add missing file for email sending checkbox
Add new rider notification email
Merge branch 'sprint17' (added new rider notification)
Fix bug in availability grid for conflicts in same cell as assignment
color coding in shift grid
Merge branch 'sprint17'

invert color coding in shift grid
add batch delete
refactor rider conflict request routine
tweak production config settings for action_mailer
add 10 sec sleep to Rider#conflict_request
try longer sleep in request_conflicts
try 60 second sleep
try 3 minute intervals between conflict requests
remove sleep from Rider#request_conflicts
turn error-raising on, uncomment 3 min sleep for conflict request
add documentation for delayed_jobs and foreman to manual page
remove delayed job implementation, tweak rider mailer specs
tweak conflict request success flash
remove extra fields from address