Adds pry as development dependency
Adds console task to rake

Automatically adds './lib' to the load path and loads the gem with pry.
See:
http://erniemiller.org/2014/02/05/7-lines-every-gems-rakefile-should-have/?utm_source=rubyweekly&utm_medium=email
Merge pull request #6 from bailiff/feature/rake_console

Feature/rake console