Comparison to matplotlib

`matplotlib` default `plot`	`prettyplotlib` default `plot`
`matplotlib` default `fill_between`	`prettyplotlib` default `fill_between`
`matplotlib` default `fill_betweenx`	`prettyplotlib` default `fill_betweenx`
`matplotlib` default `scatter`	`prettyplotlib` default `scatter`
`matplotlib` default `bar`	`prettyplotlib` default `bar`
`matplotlib` default non-annotated `bar`	`prettyplotlib` default annotated `bar`
`matplotlib` default `hist`	`prettyplotlib` default `hist`
`matplotlib` default `hist` with grid	`prettyplotlib` default `hist` with grid
`matplotlib` default `boxplot`	`prettyplotlib` default `boxplot`
`matplotlib` default `pcolormesh` positive and negative data	`prettyplotlib` default `pcolormesh` positive and negative data
`matplotlib` default `pcolormesh` positive data only	`prettyplotlib` default `pcolormesh` positive data only
`matplotlib pcolormesh` negative-valued data with labels	`prettyplotlib pcolormesh` negative-valued data with labels

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