ratago experimental release v0.2

As of this release, ratago now passes all tests from the libxslt REC, REC1, and REC2 suites. This means that all examples that appear in the XSLT 1.0 specification itself are correctly processed by ratago.

Roughly one-fourth of the 180 tests in the libxslt general suite have been enabled and are passing. Additional tests are being enabled as bugs are fixed.

There are still several unimplemented instructions and functions, including xsl:include, xsl:with-param, xsl:message, and xsl:decimal-format. The API will not stabilize until these missing instructions are implemented.