Add Tests for Static Syntactic Checks

[ddmills]

The syntactic checks (issue #52) will need tests to confirm that they are working.

[dwtj]

We will not be able to test these syntactic checks using the same testing strategy that we have been for previous proc functionality. Previously, we have been running our annotation processor on valid capsule templates. Maven automatically informs us whenever one of the generated artifacts is malformed because of some bug in our proc code. This won't work when we expect some input capsule template to be invalid, because it will crash the entire Maven build.

I propose that we run proc tests (or at least those that we expect to fail) within JUnit tests which trigger javac to compile. Over the summer, I figured out how to run javac from within JUnit tests, so this is possible.

[dwtj]

Support for writing tests which only pass upon check failure have been added as of 3dc7ad0.

[dwtj]

Tests have been drafted for all current checks as of commit 730afc3.