Merge pull request #3 from cms-edbr/Phys14

Phys14
Fill tree with dummy values when numCands==0
Include leptonicVSelector in the leptonSequence
Include the ak8GenJetsPrunedLinks
Comments on the Filter Mode option
Fix massVhad
Add primary vertex filter
Update README
Merge pull request #3 from jruizvar/Phys14

More improvements on the EDBRTreeMaker