v0.4.4

AlgebraOfGraphics v0.4.4

Diff since v0.4.3

Closed issues:

• Compatibility of pair syntax with DataFrames (#180)
• Formalisation of algebra (#184)
• Manually passed axis keywords are overridden (#195)
• xscale with densities looks strange (#205)

Merged pull requests:

• Division rather than addition for mm -> cm (#201) (@dmbates)
• respect user passed ticks (#204) (@piever)
• add FAQs section to docs (#206) (@piever)