Switching from commander to docopt
Simplified CLI commands

These commands will be called after parsing the docopt response.
Anything related to input parsing should be done in the command line
parsing side.
Essentially this new take on CLI could be seen as a small abstraction API.
Initial docopt doc strings
Forgot a few extend selfies (self)
Removed some remnant test code
renamed application.rb > helpers.rb
Death to extend self, extend with Dawn::CLI::Helpers instead
Updated lib/dawn/cli to load commands and docs
Added release commands
Removed url parameter from Release#add
docs > parser
Just run the command directly, no need for an Application class
Added highline as a dependency
Simplified Helpers#current_app_name

Currently app name look up works as the following:
first check the options for a :app, next try the ENV variable DAWN_APP,
else check the Dawn::CLI.selected_app else try to determine the app by extracting information from git.
Otherwise, the app could not be found.
App#scale does not require an `app` paramter
Added Dawn::CLI.selected_app
Set selected_app from the `--app` option
Do not echo password input
Completed commands
Compact bin/dawn

And finally rid it of commander