Issue #7: Improve alignment, remove hard tabs.
Issue #7: Define a syntax cluster for YAML values.
Issue #7: Make yamlValue pattern less specific.
Issue #7: Redefine all YAML types to include the EOL.

This prevents the yamlNumber group from blocking yamlFloat.
Issue #7: Use contains instead of containedin.
Issue #7: Eliminate the yamlValue syntax group.

Get the same effect by using the yamlTypes cluster.
Merge pull request #24 from chase/syntax-maps

Fix float and signed numbers, improve mapping, fixes #7