[travis] configure jdk8
[travis] install core
[travis] use install-file
[travis] use install-file (2)
[travis] use install-file (3)
ignore TestSplashScreen
minor pom cleanup
[travis] change artifact id
[travis] point to prerelease nem core
fix order dependency in AccountsFileDescriptorTest
Merge branch 'bug/travis-ci' into integration/20140927