add stub files for future sphinx docs.
added date index plot faq
added date index formatter example
Try again to make temporary fix for backend case-sensitivity
fixed a doc error in patches
applied gregors agg resample patch
update mathtext on review and added notes to the outline
dont install enthought.traits
Added range keyword arg to hist()
Reverting part of r5420; this should be temporary. It seems that to make "ipython -pylab" work with interactive backends, with the exceptions of tkagg and qt4agg, the old mixed-case backend names need to be preserved in the interactive_bk list.
