traits cleanup
Fix concatenate bug in contains() method
Revert numerix to 3573, second try
Reversed last commit
More numerix reversion.
added mpl like line and rect artists to sketch
reverted numerix breakage, with apologies
fix polar plots, recovered two lines accidentally deleted in _backend_agg.cpp
update enthought.traits install instructions for mpl1
completed numpification of most trivial cases
