Build universal dev bundle for yet unsupport architectures like ARM (run meteor on UDOO, Raspi and others)

Hi, we are using successful your great meteor on small arm environments (UDOO). Previously I changed your prepared installers and changed everything to the pre-installed packages.

As by Release 0.9.3 this hadn't worked, I decided to make changes so that it is possible to get an universal build if someone has already installed plattform packages for node and mongo.

So with this here, you can create a dev_bundle and run it for the not yet supported environments.

It works fine for us on Ubuntu Core 14.04 armhf (armv7l).

I am sure that this "universal" bundle is interesting for al lot of developers as well. Hopefully you will take that Pull or make something similar by yourself.

Thanks for your work.
Tom

PS: If you check the differences without "blanks" you will see just a few changes to the original sources.