Adding scripts for publishing scaladoc.

Adds a simple script that pushes scaladoc to the [BDG/ADAM website](http://bdgenomics.org/projects/adam/). E.g., for 0.12.1-SNAPSHOT, the docs are [here](http://bdgenomics.org/projects/adam/scaladoc/0.12.1-SNAPSHOT/index.html). Once this merges, I will set up Jenkins to publish scaladoc for every merge.