Added capture of a default plugin path in rrPython.py.
Changed createPluginManager so if no path is given, it will use the above default path.
Updated install instructions for rrPython.py

Updated the plugintester script to print the path where the manager
looks for plugins
Removed arguments to createPluginManager(). Demos uses default plugins folder now

This commit has the change of default path in rrPlugins.py, not previous commit
Updated more docs
Merge pull request #70 from TotteKarlsson/more_on_distro

More on distro