JZ: Rename common.pip to base.pip
JZ: Cap dj under < v1.7 (to get latest 1.6.X)
PLD: do not get key twice
PLD: check that submission is None
UK: the form list should only list active forms, downloadable=True
Merge pull request #643 from onaio/form-list-active-only

list only active forms on Formlist
PLD: test takes a dict like other json tests
JZ: Add requirements readme
JZ: Add requirements readme
JZ: Update `.travis.yml` for requirements changes.

requirements changes => #640
Merge remote-tracking branch 'origin/cleanup-submission'

* origin/cleanup-submission:
  PLD: test takes a dict like other json tests
  PLD: check that submission is None
  PLD: do not get key twice
Merge remote-tracking branch 'origin/reorganized_requirements'

* origin/reorganized_requirements:
  JZ: Update `.travis.yml` for requirements changes.
  JZ: Add requirements readme
  JZ: Add requirements readme
  JZ: Cap dj under < v1.7 (to get latest 1.6.X)
  JZ: Rename common.pip to base.pip
DW: Added a delete submission endpoint
DW: Added delete submission end point documentation
UK: remove trailing slash
UK: skip _attachments in csv exports, closes #644
UK: ensure we have a unique name when adding multiple select choices as elements, closes #366
UK: _attachment, empty list on csv export
UK: pip install -r base.pip
DW: Prepares onadata for the python json xls lib which will be added