Some extra tests.
AccountStore.new_user() gives us bytes, not unicode. Update test helper to match and fix things that expect unicode they may not always get.
Merge branch 'feature/issue-846-fix-setup-env-again' into develop
Update diamondash bower dependency, and with it d3 (thanks @hodgestar)
Merge branch 'develop' of github.com:praekelt/vumi-go into develop
Remove unused nose stuff.
Shift some things around to avoid importing Django in go.vumitools.billing_worker.
Fix import in billing_worker.
include session events in the export
include transport type & direction
remove export_conversation_messages_sorted
Merge branch 'feature/issue-853-remove-message-export-sorted' into feature/issue-852-include-dr-status-in-message-export

Conflicts:
	go/conversation/tests.py
add UnicodeDictWriter
use UnicodeDictWriter
Merge branch 'develop' into feature/issue-851-message-export-session-flags

Conflicts:
	go/conversation/tests.py
Merge branch 'feature/issue-851-message-export-session-flags' into feature/issue-852-include-dr-status-in-message-export
restore tests deleted during conflict merge
Merge branch 'feature/issue-851-message-export-session-flags' into feature/issue-852-include-dr-status-in-message-export
fix requirements.pip and add secret key
Merge branch 'develop' of github.com:praekelt/vumi-go into feature/issue-844-application-multiplexer