Merge pull request #6 from brettcave/master

chef 11 compatibility
update support to chef 11
Merge pull request #7 from brettcave/master

Added "outputs" module, to retrieve the outputs of a stack
remove old gem file
rebuild with version 0.1.7 with update #7 changes from brett cave
Allow parameter-formatted output
allow install with Chef version 12
Merge remote-tracking branch 'upstream/master' (sync from neillturner/knife-cfn)