Make sample substring detection case insensitive
Delete unused MHT producer which conflicts with MVA MET recipe
Don't assert that the seedJet must be non-null

The only bad part of skipping this is the MET systematic, which
is not used by many people, may be slightly underestimated.
The cause of this is unknown and should be investigated, but it
is a tiny corner case.  This should workaround/fix #263.
Use a non-transient example .root file for testing
Merge pull request #262 from ekfriis/summer2013

Make sample feature auto-detection case insensitive + fix seedJet assert