Switch default ruby to 1.9.1 and run foreman with nohup in huginn_development cookbook

Without ruby 1.9.1 on ubuntu precise/precise64 bundler gets
really confused.

In addition this change makes foreman run with nohup and in background.
Otherwise chef never finishes provisioning.
Add support for vagrant-parallels provider in Vagrantfile

For those who want to experiment with huginn on a Mac.
vagrant-parallels is a provider that bridges Vagrant and Parallels
Desktop
Merge pull request #256 from racktear/master

Switch default ruby to 1.9.1 and run foreman with nohup in huginn_development cookbook