[428976] Make Sirius compile with Guava 11.0.2 through 15.0

Guava 15 is not yet available in the Orbit repo we use, but it can
be found in:

http://build.eclipse.org/orbit/committers/orbit-I/20140224171915/I20140224171915/repository/

Change-Id: Ib922ddcb59e188da48364991d4969845d64dadbd
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
[428976] Update target platforms to accept newer versions of Guava

Change-Id: If9376d232447d2d2a1cd96f6a78c113cb3606e67
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>