Iteratee: don't make assumptions on # args to pass
Implement findKey and findIndex helpers
find*: style tweak and test coverage
Merge pull request #1587 from megawac/find-index

Add _.findKey and _.findIndex
move _.before gc conditional to a single line
check for array length when evaluating isSorted
removed tabs to conform with coding style
Merge pull request #1917 from tjbarber/avoid-returning-zero-truthy-isSorted

Fixes #1870: _.indexOf with `isSorted` of `true` will incorrectly match `undefined` on an empty array.
Added _.propertyOf method and tests
Used function(){} in place of _.noop
Merge pull request #1921 from bathos/master

Added _.propertyOf method
Add _.keysIn method
Merge pull request #1910 from thejameskyle/keysIn

Add _.keysIn method
Merge pull request #1902 from megawac/iteratee-args

Iteratee: don't make assumptions on # args to pass