[8u] post-commit review for: RT-40341: Update copyright header for files modified in 2015

[Kevin Rushforth]

JIRA: https://javafx-jira.kenai.com/browse/RT-40341
Changeset:  http://hg.openjdk.java.net/openjfx/8u-dev/rt/rev/e1295ea74649

Simple change to update copyright dates for all files modified in 2015.

-- Kevin