adds a test I was curious about.
adds another expect_float_equal to the zeromat extraction test.
Merge pull request #474 from katyhuff/zeromat

adds extra material tests that deal with near-zero quantity issues
allows extraction in grams and adds a test accordingly.
edits the extract_in_grams test for readability
edits the extract_in_grams test for readability
adds isovector comparison tests, these fail as @gidden predicted, explaining a lot of drama I was seeing in actual simulations.
this fixes all compiler-related errors for me, iso vectors still don't equate to equal
added an isovector test to confirm the == operator works as intended
added simple test to diagnose the problem
changed from testing equality of pointers to equality of underlying compositions
added isotopic checks to other absorb tests just in case
Merge pull request #476 from katyhuff/extract_eps

Allows Material::extract to optionally occur in grams, fixes compiler related issues with the material class, and updates the equality for isovectors. Previously, isovectors compared equality based on pointers, now they compare based on equality of their compositions. It is not clear to me how this will affect performance; however, I believe this is the correct behavior for the == operator. If we really need to check comp map pointer equality, we can add a different method to do that.
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