updates gemfile and shipcloud.gemspec

* moves gem dependencies to shipcloud.gemspec
* adds and updates versions for gem dependencies
adds console task to rakefile

adds a console task to the rakefile to provide an easy accessible
playground for the gem.

http://erniemiller.org/2014/02/05/7-lines-every-gems-rakefile-should-have/
adds debug option to configuration

adds debug option to configuration to control debug output.
replaces be_true and be_false with be true/false

"`be_false` is deprecated. Use `be_falsey` (for Ruby's conditional semantics) or
`be false` (for exact `== false` equality) instead."
adds vendor/bundle to .gitignore
bump version to 0.4.0