bind gaussian

[zvictor]

For some reason, when using the gaussian function in my Meteor environment it does not work because this === Window inside the gaussian method.

This PR should make it safe.

[coveralls]

Coverage increased (+0.2%) to 75.0% when pulling 8bce755 on zvictor:patch-1 into 63db557 on Planeshifter:master.

[Planeshifter]

Thanks for filing this pull request! I published a new version of the module that should solve your problems when using it with Meteor. I switched out the gaussian module to my own implementation of the Gaussian pdf.