Atom Cucumber Runner Package

Total rip-off of the atom-rspec package, but runs cucumber instead. I should refactor the common bits out, but for now I just wanted something working. I'm lazy like that, which isn't really the good kind of lazy. Sigh

Add ability to run Cucumber and see the output without leaving Atom.

HotKeys:

• alt+cmd+k - executes current feature file
• ctrl+cmd+ - executes only the cuke on the line the cursor's at
• ctrl+alt+k - re-executes the last executed cuke