Merge branch 'dev' into master

Conflicts:
.gitignore
.jshintrc
CHANGELOG
Gruntfile.coffee
ReadMe.md
example/index.html
package.json
src/longo.js
src/longoWorker.js
test/index.html
test/spec/aggregate.js
test/spec/collection.js
test/spec/cursor.js
test/spec/db.js