shortened filename namespace for ease of use
updated XMLFileLoader and XMLParser, moving throwable code out of constructors/destructors and made functional arguments const where possible
Updated Env and DynamicModule to find module libraries in the envrionemnet
@rwcarlsen updated work in the previous commit and adds tests for the
envrionment and dynamic module classes
updated findModuleLib's implementation to explicitly look in the cyclus install
path first, provided a functional interface to the name of the module
environment variable, cleaned things up a bit, and added some clarifying
comments
removed dynamic module destructor, per @rwcarlsen's request
changed nonstandardpath finding tests to use home dir eliminating sudo need for tests to pass
merged find-modules-rebase.  more intelligent and robust searching for module library files. closes #480