upgrade aspectj plugin - support for jdk8
Merge pull request #742 from Unicon/aspectj-plugin-jdk8

Upgrade aspectj plugin - support for jdk8
Allow Travis to use JDK8 in the build matrix
fixed test failures on jdk8. json field order mismatch
#754 - Incorrect labels in russian for next messages:
screen.service.error.header
screen.service.error.message
screen.service.empty.error.message
Merge pull request #755 from danil-zarubin/754

#754 - Incorrect labels in russian for next messages:
Merge pull request #752 from Unicon/jdk8-test-fixes

Fix test failures on JDK8
Merge branch 'master' into dyna-principal-attrs-468
Removed unneeded constant