rplot: copy root2matplotlib.py from rootpy source
rplot: remove dependency on rootpy (incomplete)

Need to re-implement get_limits from rootpy.plotting.utils using ROOT
only classes to complete this conversion.
rplot: plotting module first steps

move browse.py to rplot.py (with changes)
rdir: minor
rdir: documentation on path parsing in pathspec
rplotsh: fix completion
rplotsh: add pwd command
rplotsh: add 'cd -' command (also bugfix oldpwd)
rplotsh: help message update
rplotsh: minor
rplotsh: bugfix completion with filename prefixes
rplotsh: new command to read objects
rplotsh: interactive python console
rplotsh: move read commands
rplotsh: change read and python implementation
rplotsh: minor
rplot: Rplot plotter class (incomplete)
Merge branch 'rdir' into rplot

* rdir: (13 commits)
  rplotsh: minor
  ...
rplot: bugfix extra parentheses
rplot: clean-up