Merge tag '1.5.1' into develop

v1.5.1

- Trivial bugfix release
Fix custom prose namespacing to fit with documentation
always send payload, if not an array assume it's in the correct format
Merge pull request #84 from datasift/feature/http-fix

always send payload, if not an array assume it's in the correct format
Fix: p2p1 in the interfaces list. not p20p1
Merge pull request #83 from muteor/develop

Fix custom prose namespacing to fit with documentation
WIP improve ansible provisioner
Merge branch 'develop' of git://github.com/datasift/storyplayer into develop
Fix: support more complex Ansible inventories correctly
Version bump: bug-fix release
Merge branch 'release/1.5.2'