[sakai-pmc] Support JDK 8

[Matthew Buckett]

With JDK 7 having about 14 months of support left I was looking at
supporting JDK 8 in the build:

https://jira.sakaiproject.org/browse/SAK-25771

Does anyone have any comments about moving in this direction?

-- 
  Matthew Buckett, VLE Developer, IT Services, University of Oxford
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