Update interpreter to support Iterable<T> (fixes #79)
Compile and build jar in-process
Suppress ARGUMENT_COUNT_MISMATCH for missing arguments if NO_SUCH_ATTRIBUTE was reported already
Don't hide execution errors from the test harness (could hide test failures)
Fix error message now that template group files are not required to contain any templates
Merge pull request #81 from sharwell/testing-updates

Testing updates
Merge pull request #80 from sharwell/fix-79

Update interpreter to support Iterable<T> (fixes #79)