Revert "No more implied reconfiguration of caches [TORQUE-1169]"

This reverts commit ab0803590812a71884aebad6915261629635d49e.
Revert "Bumping Infinispan up to 6.0.0.CR1 [TORQUE-1168]"

This reverts commit 45f213ae30c3b2440654f678adf9541945992edb.
Pin the mime-types gem to a specific version so it continues to work in Ruby 1.8 mode
Catch and retry from more rubygems failures
Pin the org.eclipse.core.runtime transitive dependency to a working version
Rubygems is the best!

Sleep and retry some more because gem installations fail more often
than they succeed.
copy/paste fudge
Revert rubygems retry hacks to test against rubygems.org changes