Close file descriptor

Fix for leaking opened file descriptor
Merge pull request #8 from aju/patch-1

Close file descriptor
v0.1.5
Replace inter-process communication implementation
Merge branch 'master' into replace/ipc

Conflicts:
	lib/spawn.js
	package.json
Update README
Merge pull request #9 from peerigon/replace/ipc

Replace IPC
Add CHANGELOG
v1.0.0
Improve stack traces inside PhantomJS
Improve examples #7
v1.0.1
Fix an error where a promise could have been rejected after it has already been resolved
v1.0.2