Get it to work (mostly) with older versions of rdkit

Travis build would be faster if we could use the Ubuntu RPM
version of rdkit, but unfortunately that is old and doesn't know
about the element Dubnium. This hacky work-around solves it.
Helpful for people wanting to use Ubuntu, without QM.
(QM features require RDKit to be built with InChI support, which
means you have to build it from source anyway)
Merge pull request #231 from rwest/oldrdkit

Get it to work (mostly) with older versions of rdkit
Update RMG example 1,3-hexadiene with multiplicity label
Update RMG example c3h4 with multiplicity label
Update RMG example ch3no2 with multiplicity label
Update RMG example diesel with multiplicity label
Update RMG example e85 with multiplicity label
Update RMG example liquid_phase with multiplicity label
Update RMG example methylformate with multiplicity label
Update RMG example minimal with multiplicity label
Update RMG example minimal_sensitivity with multiplicity label
Update RMG example TEOS with multiplicity label
Add multiplicity label to loadEntry for transport libraries
Add multiplicity label to loadEntry for thermo libraries and groups
Add multiplicity label to loadEntry for statmech depository
Add multiplicity label to class Entry and loadEntry for forbidden
structures
Add multiplicity label to loadEntry for kinetics depository
Add multiplicity label to loadEntry for kinetic groups
Add multiplicity label in loadEntry for kinetic libraries
Add multiplicity label to group.py

- remove multiplicity from GroupAtom
- add multiplicity to Group
- update __gainRadical() and __loseRadical()
- update equivalent() and isSpecificCaseOf()