0.4.0

Main changes

• fix performance bug due to changes in core MathJax v2.5 #89
• Fix incorrect SVG widths when manual linebreaks are used #104
• Enable iojs / node 4 compatibility #110, #122
• add tape tests & CI #83
• randomize temp image files to allow for concurrency #117
  • thanks to @onomojo
• add some examples to readme, #100
• Fix issues in package.json #105, #113