Merge pull request #5 from whitequark/master

Add [%stri] structure item pattern and expression quotation
Update ppx_metaquot.ml

Document %stri
Merge pull request #6 from whitequark/master

Add plumbing to integrate with ppx support in trunk ocamlfind
Create a findlib sub-package for metaquot, so that users can use the ppx_tools library without the ppx metaquot.