Make deepPluck and deepHas work with strings
Don't let deepMapValues change original object

fixes #22
Fix minify race condition in gulpfile
Add inherited & non-enumerable property tests
Merge pull request #25 from beaugunderson/master

Several improvements / bug fixes:
- Make deepPluck and deepHas work with strings
- Don't let deepMapValues change original object
- Fix minify race condition in gulpfile