Release 3.0.0-rc.1

Initial release after forking from rholder/guava-retrying.

Primary Features

Updated to use Java 8 and Guava 23.0

Issues Resolved

#1 Guava should be pinned to a specific version
#2 Building shows several Javadoc warnings
#3 Version of gradle is relatively old
#5 Project needs to be updated to reflect that it is a fork of guava-retrying
#8 Cannot be compiled with Guava 23