Prepare build environment

1. In case Ubuntu 14.04:
- add presice repository with low priority (pinning 300)
- install multistrap version 2.1.6 from precise repo which
  has higher priority over trusty
2. In case Ubuntu 12.04:
- add chris-lea (for nodejs) repository with higher priority
- install nodejs from chris-lea repository
3. For all distributions
- fixed npm global installation permission issue

Closes-Bug: #1337343
Closes-Bug: #1312654
Change-Id: I62ba9257fb3d575d996bf4c57b5d983c0050fd3b