Merge pull request #386 from jchodera/master

Added step limit for LocalEnergyMinimizer in Modeller.addHydrogens() to fix hangs on bad structures
Exposed getMolecules() in the public API
Added getMolecules() to swigInputConfig.py
Merge pull request #388 from peastman/master

Exposed getMolecules() in the public API
Install SWIG interface definition to the include directory, so outside plugins can use it when building their Python APIs
Merge branch 'master' of https://github.com/peastman/openmm
Merge pull request #390 from peastman/master

Install SWIG interface definition to the include directory, so outside plugins can use it when building their Python APIs
Fixed a compilation error in C wrappers
Merge pull request #391 from peastman/master

Fixed a compilation error in C wrappers
A previous commit had changed OpenMM_headers.i to OpenMMSwigHeaders.i without changing the corresponding include statement in OpenMM.i.