Merge pull request #4 from alexconway808/master

refactored the compact method to push instead of splice the original inp...
added updates to js
Merge branch 'master' of https://github.com/Gitthere/brodash
compact and difference working.  added code for findIndex that is commented out.
created the method for findLastIndex and tested
Merge branch 'gitthere_master' into firstLastIndex