Use JSHint in addition to JSLint during development
Add "gulp-jshint" to "package.json"

- Allow Node 0.8+, not just 0.10+
  (recommended in http://www.nearform.com/nodecrunch/dont-use-nodes-core-stream-module)
Add "laxbreak" JSHint flag
Merge pull request #8 from pandell/use-jshint

Use JSHint in addition to JSLint during development