Added conda recipe building for Linux.

This adds automated building of a dev version of biggus to the dev channel of scitools.

It was my intention to maintain order-ability for each build, but it turned out to be a non-trivial problem (there isn't enough information in the way we manage branches to do this). Therefore, I ruled it out of scope, and instead went for the less ambitious approach of maintaining the branch name in the version. Once these builds are complete, they will have a version string along the lines of ``<name of branch>.<n commits since start of repo>.g<GIT SHA>``. For example, on master a version such as ``master.178.g9a2c919`` may occur.
It only works when merged. BINSTAR_TOKEN is only defined then.