Fixing bug where spurious paragraphs are emitted.
Misc tweakages
Merge pull request #1 from raffazizzi/master

Added HTML step
Promoted XHTML namespace declaration to top

Consequently, all elements (not only those emitted by the template
matching the root) will be bound to this namespace, preventing incorrect
namespace "undeclarations" from appearing.
More slight edits to HTML stylesheet

Completed namespace cleanup; minor cosmetic enhancements.
Refactored XProc files

New display-xhtml pipeline can be run separately.
Changes for validity of result to TEI-Lite
New test to find issues with addSpan
More slight enhancements to HTML rendition
replaced pointers with xincludes
commented out template matching ptr