Added Mac OS X specific installation instructions

- created new doc folder
- removed doc folder from .gitignore
- included and updated instructions as mentioned in issue #59
- updated the README with a hint on the Mac OS X specific instructions
Merge pull request #58 from arax/client-dev

Fixes #52 by allowing relative resource paths
Updated sentence in Mac OS X install doc as proposed
Merge pull request #64 from ffeldhaus/master

Added Mac OS X specific installation instructions
Merge pull request #65 from arax/client-dev

Storagelink and networkinterface support for bin/occi