adds a unit test that hits the LibraryStatement and UsingStatement code in instrumentSolidity.js.
verifies that coverage works for library methods - e.g. instrumentation is generated for both the contract that calls the library and the library itself.
modifies a regex in test/util/vm.js that allowed the library abi through, causing problems.
This PR:
instrumentSolidity.js.test/util/vm.jsthat allowed the library abi through, causing problems.