Fix charges and lone pairs for Helium in fromAdjacencyList() and updateCharge().

Also made calculating charges no longer redundent since it is done in updateCharge().
Special inchi handling for both H and He.
Add a Helium unit test.
Merge pull request #273 from connie/master

Fix handling of Helium in RMG-Py. Looks good to me, and passes Travis tests.
Import inerts from Java kinetic libraries with normal case rather than uppercase.

This makes it consistent with other parts where we load inerts (in chemkin.py for instance.)
Add set of bath gases (Ar, Ne, He, and N2) to all RMG jobs just like Java.
Only index the reactive species, not the inerts.

We might run into some trouble in terms of nonreactive / nonbath gas species
like in liquid phase with water.  But probably they won't want that species
to be indexed anyway.