Towards release of Jena 2.12.0

[Andy Seaborne <an...@apache.org>]

I've finished the changes for Java7 and hopefully the codebase is 
warning-free now. [*]  There is one outstanding item JENA-728 (ARQ 
documentation for QueryExecution being AutoCloseable) and there may be 
other things in the documentation that need polishing.

With all the language updates, I think it's wise to have a short period 
to see whether it's stable and usable just to catch any major gotcha's. 
  The more the current development snapshots get tested the better.

There are some other streams of work in JIRA and we need to work out 
which are going to be done for 2.12.0.

Thoughts?

	Andy

[*] Aside - we probably ought to have an agreed set of Eclipse settings 
for warning levels.  There have been quite of changes for Eclipse Luna 
and I was seeing differences even between the RC's and the final 
release. We have to tunr off some warning like the hiding ones.  This is 
all separate from doclint issues.