Update/create abmapper.json

[ValentinMarcon]

Please pull this in!

Here are the changes:

1. Diff in {description}
   -Orig val : Portable, easy-to-use package for spliced alignment, junction site detection, and reads mapping.
   -New val : A suffix array-based tool for multi-location searching and splice-junction mapping

2. Diff in {homepage}
   -Orig val : http://www.hkbic.cuhk.edu.hk/software/abmapper
   -New val : http://abmapper.sourceforge.net/

3. Diff in {publication}{0}{doi}
   -Orig val : null
   -New val : 10.1093/bioinformatics/btq656

4. Diff in {publication}{0}{pmcid}
   -Orig val : null
   -New val : PMC3031031