Compatibility with Jetty 9.2.10.v20150310#1

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trasa wants to merge 7 commits intojcern:masterfrom

Commits on May 18, 2015

Changed jetty + supporting libs to use the versions that I am using
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MemSession doesn't exist in Jetty 9.1, switched back to using the abstract Session class from the jetty 8 implementation
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3.1.0 RELEASE
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Commits on Jun 24, 2015

Commits on Jan 13, 2016

Cleaning up to create pull request
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Commits on Jan 14, 2016

Use Bool, not Long, to determine if session key exists
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