Beginning basic support for prepared types.
Add UUID unpack and add missing org.apache stuff.
Add prepare_prepared_cql function.
Add packing for varint and decimal types.
Add tests for the new cql stuff.
Add test cases for uuid and timeuuid columns and fix bug.

The unpack code had a slight mistake in the pack template.
Update test cases and code for new CQL3.
Merge pull request #33 from Lanzaa/cql-prepared-statements-02

CQL exec call using prepared statement