Khan/KaTeX — pull request #57 by simon04 (2014-09-16 20:06:14+00:00)
Title: Add more arrows such as `\mapsto`, `\leadsto`

The following arrows are added:
`\Leftarrow`, `\longleftarrow`, `\leftrightarrow`, `\longleftrightarrow`,
`\Rightarrow`, `\longrightarrow`, `\leadsto`, `\mapsto`, `\longmapsto`