Added linewidth kwarg to bar, barh; fixed bugs
Improve colorbar example
Improved pcolormesh arg and kwarg handling to match pcolor
Pcolor supports 1-D or 2-D arrays for X and Y
added lazy evaluation of default transform
additional kwarg docs for init funcs
Remove do-nothing line
New colors.LogNorm; support in colorbar; example in pcolor_log.py
Make rc defaults in __init__.py match those in matplotlibrc
Changed class names in colors.py to match convention
