BLD: statsmodels testing versions now 0.5.0, except py2.6 for 0.4.3
dataframe bar plot can now accept width and pos keywords for more flexible alignment
BUG: Seed RNG in test_partially_invalid_plot_data
Use a context manager for RNG
Merge pull request #6670 from TomAugspurger/partially-invalid-plot

BUG/ENH: RNG ContextManager. Use in test_partially_invalid_plot_data