v0.5.17

ApproxFunBase v0.5.17

Diff since v0.5.16

Closed issues:

• Multiplications of derivatives is too permissible, even if spaces aren't compatible (#111)

Merged pull requests:

• fix Neumann docstring (#126) (@jishnub)
• backport: fix Neumann docstring (#127) (@jishnub)
• fix integral docstring (on v0.5) (#128) (@jishnub)
• Fix integral doc (#129) (@jishnub)
• SubOperator index with colon (#130) (@jishnub)
• Index SubOperator with colon (backport to v0.5) (#131) (@jishnub)
• fix undef var in matrix conversion error message (#132) (@jishnub)
• Version bump to v0.6.2 (#133) (@jishnub)
• backport #132 to v0.5 (#134) (@jishnub)