Heads-up: Bumping minimum build number to b113

[Kevin Rushforth]

As a heads-up, I need to bump the minimum JDK 8 version number required 
for building FX to b113 (is currently b112) to fix a problem building 
one of our closed files that uses a java.net class in the JDK which has 
changed.

FX JIRA:  https://javafx-jira.kenai.com/browse/RT-34085
JDK issue which broke us:  https://bugs.openjdk.java.net/browse/JDK-8014719

I will push this change shortly.

-- Kevin