add documentation for figure show method in backend_bases and backend_template#835

Closed

mdboom wants to merge 2 commits intomatplotlib:masterfrom

mdboom:issue835

Commits on Aug 28, 2012

Add a "show" method to figures that don't have a GUI backend. Fixed #835.
mdboom
committed
Warn when calling "show" in a non-GUI backend, and provide a convenient way to suppress the warning.
mdboom
committed