added jQuery's extend method into Pouch.utils
replaced JSON.parse(JSON.stringify( with jQuery's extend method
Merge branch 'master' into 337-extend-method
using actual jQuery extend instead of node-extend
Merge pull request #354 from ymichael/337-extend-method

#337 added jQuery extend method to Pouch.utils
Merge branch 'master' of github.com:daleharvey/pouchdb