PLD: WIP #411 move label functionality to helper and add to projects
PLD: helpers init
PLD: use labels mixin
PLD: add comments and ensure instance of xform for signal in delete, closes #411
PLD: add docs for tagging projects
PLD: use status var
PLD: remove superfluous data kwarg
PLD: remove query object for specific form code
PLD: fix spacing
Merge pull request #412 from onaio/411-tagging-projects

411 tagging projects