arm7l support to c9 installer script

NOTE!
arm-pi build of node 0.10.28 does not exist, changed to later version 0.10.3 which contains a arm build.

http://nodejs.org/dist/v0.10.3/

http://nodejs.org/dist/v0.10.28/

Tested on BeagleBone Black
Merge pull request #16 from timkalinowski/master

arm7l support to c9 installer script