BUG: Use axes if passed in to plot series, and pass params from plot_dataframe
ENH: Use existing figure if there is one
ENH: Use colormap for plotting lines
ENH: Pass column colors for linestrings
ENH: Handle MultiLineString geometries when plotting
BUG: pass alpha paramete through plot calls
BUG: Return axes from plot_dataframe and explicitly draw figure for both plot functions
DOC: Finally some docstrings for the plotting functions
ENH: Allow parameter for setting alpha for series plot
Merge pull request #40 from kjordahl/feature/plotting_updates

Plotting updates