adding timestamps on contact and connection model
fixed typo in datefield argument
typo in name, makes sense now
Document that we'd like changes against the develop branch, not master
Refs #348: Mention and link to Gitflow
Refs #344: Add docs about logging

Spell out best practice for logging. Give example of capturing
rapidsms logging.
Refs #346: Add timestamps to Contact and Connection

Thanks to @xkmato - add created_on and modified_on timestamps
to Contact and Connection.
Also add migration and mention in the release notes.
Refs #346: Fix doc syntax
document Kannel's delivery report functionality
point to Vumi's repo; fix indentation in Vumi config; update username/password syntax; raise error if we don't get a 200 status code
Merge pull request #344 from rapidsms/docs/344-logging-best-practice

Update template and docs to reflect new logging best practices
Merge pull request #348 from rapidsms/use-gitflow

Use gitflow develop branch
Merge remote-tracking branch 'xkmato/time_stamps_on_contact' into develop
Merge branch 'feature/346-contact-timestamps' into develop
mention django admin in the devivery report intro; fix typo in first paragraph
Merge pull request #241 from rapidsms/feature/finalize-vumi

Coordinate with Vumi team to complete RapidSMS Relay
catch exceptions during sending with BlockingRouter; update exception handling on Celery/Database router to match
update docs to mention how exceptions are handled
Merge pull request #300 from rapidsms/feature/doc-kannel-delivery-report

Document Kannel's delivery report functionality
Misc. updates in response to bulk messaging pull request comments