Merge pull request #4 from yyfrankyy/master

bugfixes; use gyp as building tool; upgrade cityhash to 1.0.3
Add test script to package.json
Normalize module name to cityhash and export it
Fix compilation

Non-system headers should use quotes
Remove dead gyp file
Merge pull request #6 from rmg/node-0.10

Build and run on Node v0.10.x
ready for npm version