Add ability to pass in array of vals instead of as separate params

- Fixed so del now accepts an array of keys rather than just lots of
params (should work for other commands too)
- Added test cases for the del command and testing both multiple params
and one array param
- Updated .gitignore to include node_modules
Updated to use the wrapper style
Merge pull request #26 from toddbluhm/accept-arrays-for-del

Add ability to pass in an array of vals instead of as separate params