data types, text, parameters
Merge pull request #94 from nfour/patch-1

data types, text, parameters
swapping in bluebird, some promise cleanup
fix incorrect values passed to typeFloat in mysql
fix incorrect values passed to typeDecimal in postgres
re-doc for 0.4.12 release
release 0.4.12
fix  #98, aggregates on toString / clone
docs for 0.4.13
release 0.4.13
cleanup on the .then interface
Merge branch 'bluebird'

* bluebird:
  cleanup on the .then interface
  swapping in bluebird, some promise cleanup
merging bluebird into migrations
merging with master
working on the migrations spec, debugging bluebird