v1.5.3

PGFPlotsX v1.5.3

Diff since v1.5.1

Closed issues:

• Any plan to support XeLaTeX compilation? (#290)
• sp_width is undefined (#303)
• How to make a plot with empty coordinates (#304)

Merged pull requests:

• use OrderedCollections over DataStructures (#305) (@KristofferC)
• move from using Requires.jl to using extensions on Julia versions that support it (#306) (@KristofferC)
• only load Requires when needed (#307) (@KristofferC)