Adapt README.
Add Unicode 6.3 categories and select properties as predefined regular
expressions.
Update README to reflect additional predefined regular expressions.
Fix indentation of additions to 'DISTRIB'.
Fix typos.
Support for a Compl (complement) operator on single-character regexps.
Merge pull request #2 from sghost/master

Additional predefined regular expressions
Update META to use ppx support in ocamlfind >=1.5.
Add .gitignore.
Add opam file and reflect ocamlfind >=1.5 dependency.
Rename sedlex_ppx.ml to ppx_sedlex.ml for consistency.
Make ppx_sedlex.ml use ppx_metaquot.