Merge pull request #2 from nsimplex/master

Porting to Linux/Mac and other improvements.
Merge pull request #3 from nsimplex/master

Allowing suppressing the autocompilation of a mod
Added initial support for custom player animations.

- symbol pivots are always calculated and exported so that the Spriter
builds match the Flash builds.
- inverse symbol pivots are applied to the timeline pivots which should
allow you to continue animating your Spriter pivots despite how weird
that is :).
Pathing fixes to deal with spaces in folders.
path fixes to account for spaces under Unix