JCLOUDS-412. Add the new i2.* instance sizes
Address miscellaneous Guava deprecations

References JCLOUDS-415.
Replace calls to Closeables.closeQuietly

Guava 16 removes this API.  Replace with Closeables2.closeQuietly.
References JCLOUDS-413 and JCLOUDS-415.
Remove erroneous deprecation of ByteSource method
Upgrade to Apache Rat 0.10

Notably this release resolves RAT-138 which caused excessive run-times
with some inputs.  Changelog:

http://creadur.apache.org/rat/RELEASE_NOTES.txt
Added OkHttp driver to support modern HTTP verbs