Merge pull request #1021 from songawee/master

Update readme to explain some of the waffle features
Labels can only be manage/updated by collaborators

Updated README to reflect reality.
Merge pull request #1150 from ericboehs/patch-1

Labels can only be manage/updated by collaborators
added graph info to waffle.io README
Merge pull request #1293 from waffleio/graphs

added graph info to waffle.io README