refactor for rspec 3
Merge pull request #129 from spaungam/rspec3

Refactor for rspec 3
include support for display of buildpack version
Merge pull request #130 from spaungam/version

Version
resolve deprecation warnings from rspec3
Merge pull request #131 from spaungam/deprecation

Fix deprecated warning messages after moving to rspec3.
merge latest changes from master