Lwt depend on camlp4
jenkins.sh: install camlp4
Jenkins: fix previous
Fix some minor typos in documentation strings
Implement ppx syntax extension.

Initial patch by Drup.
Implement exception match cases in ppx extension.
Documentation for ppx syntax extension.

and small grammar/spelling fixes for pa documentation.
Fix documentation and wiki generation and opam file.
Ppx documentation improvements.
Use a custom flag to pick native or byte ppx executable.
Merge pull request #83 from Leonidas-from-XIV/bugfix/doc-typo

Fix some minor typos in documentation strings
typo
Decouple try and finally.
Register attributes on `[%lwt ...]` nodes.
Merge pull request #75 from ocsigen/ppx

Ppx syntax extension