added fix to allow root=param in git declaration of ext_pillar, merged into 2014.1

Tests for module concerned are passing.

Added support to ext_pillar to allow subdirectory of git repo to be used as pillar directory. Allowing:

```yaml
ext_pillar:
  - git: master git://github.com/crasiak/pillar_files.git root=pillars
```
Also fixed syntax error in iptables.py, line 137 by adding colon.

Merged into 2014.1 before issuing PR.

Please advise how to proceed if other tests break Jenkins build.

Thanks