Removed nonfunctional sensitivity unit test from solver unit test.
Fixed circular import error.
Fixed reading of input files for RMG-Java reactor systems.

Reactor systems is equal to total number of reaction conditions
multipled by the number of concentration conditions.
Fixed bug in flux diagram generation requiring special species name formatting.

The pydot graph node and edge names stores labels that include
special characters with added quotation marks, causing node and edge identification
problems. This fixes the bug to accomodate more species' names in chemkin files.