Fixed 'prep' target in Makefile.
Version bump to 0.5.11.
Fixed line continuations.

Added synStContinuation field to SyntaxState.
Set this in pLineContinue.
in pEndLine, reset it (and skip other line-end processing) if it is set.

Closes #51.
Updated changelog.
Fixed rest.xml regex (closes #54), bumped version to 0.5.11.1.