1. schedule.rb defines cron job schedule (run 'whenever --update-crontab' to start, 'whenever -c' to stop)

2. The cronjob(s) run the import rake task: rake 'import_group[DB_URL,TABLE,GROUP_NAME_ID]'

3. The rake task runs the import method (ImportHelper.update_or_create_group_from_db_table with params)

4. The import method does the heavy lifting of connecting to the external DB, grabbing phone numbers, matching/creating recipients, and updating/creating the group.
Merge branch 'develop' into import
remove every 1.day import from schedule
added if != null in index partials
added batch_id to conversations and conversation logging
Merge pull request #230 from codeforamerica/andyUI

Andy ui
changed conversation sent query
updated the rake task update_conversations
updated response partial
Adding phone normalization.
fixed dashboard charts
added new charting method
added view all buttons to home page graphs
Merge pull request #231 from codeforamerica/andyUI

Andy ui
fixed dashboard graphs
adding undelivered graph
added typicons and restyled sidebar
added user menu to the admin navbar
minor changes
merging with develop