Merge pull request #27 from s-pearce/vel

Vel
Ported some functions to C (pygsw)
Merge pull request #28 from lukecampbell/improved-pygsw

Ported some functions to C (pygsw)
Fixes broken test
Merge pull request #29 from lukecampbell/test-fix

Fixes broken test
Fixes syntax errors
Merge pull request #30 from ooici/bug-fixes

Fixes syntax errors
added some efficiency changes via numexpr