Move to java 1.8
Allow batch fetching of objects

- getjob and getreadset can now get multiple objects at once (still
multiple http calls right now)
- removed all the plural parameter names in favor of repeating single
named params. this should reduce confusion when using the cl.
Constants moved to docs repo

Now available here: 
http://google-genomics.readthedocs.org/en/latest/constants.html

backed by this:
https://github.com/googlegenomics/docs/blob/master/constants.rst
Link to the docs