Add module saxon-adapter

Expose Saxon's Processor, XPathFactory and TransformerFactory
with our custom XPath extension functions as OSGi services
saxon-adapter: make setURIResolver optional
Add runtime dependencies to POM
Update to Pipeline 1.8
Add javax.persistence to runtime dependencies
Import framework-bom instead of inheriting from framework-parent
Merge pull request #5 from daisy/saxon_adapter

Close #5