No test suite

[jw35]

This code doesn't have a test suite. This makes all changes risky, and makes it particularly difficult to be sure that changes won't break compatibility with currently-supported PHP versions. This in turn makes merging pull requests difficult and so slows the rate at which this can happen.

Fixing this is probably not an enormous amount of work. The Ucam WebAuth Java toolkit test suite might be an inspiration.

[jw35]

There's now an extremely-minimal test suite (see PR #8) that does little more than check that the code compiles. Much better than nothing (especially in association with Travis-CI which is now running the test suite on every commit), but still far from good enough.