Sp? is redundant…

The definition of Sp is:

    Sp = Spacechar*

so the matching of chars is already optional.
Merge pull request #24 from ingydotnet/master

Grammar tweak
Makefile now makes libraries
Added support for C++ in library header
Merge pull request #26 from Zaffy/master

Makefile makes libs. Added support for C++ in library header file
Merge remote-tracking branch 'upstream/master'

Conflicts:
	markdown_parser.leg