Ocsigen_lib : Add Option.get'.

A non-lazy version of Option.get.
fix META (typo and requires to ocsigenserver)
Fix bug in Ocsigen_range
(was broken for big files with range > 8192 bytes)
Merge pull request #10 from malo-denielou/master

fix META (typo and requires to ocsigenserver)
UTF-8 README.
Merge pull request #13 from vbmithr/utf8

UTF-8 README.
run.local and run.opt.local are now compatible with OPAM usage.
Create local/var/log and local/var/run as needed by ocsigenserver to run.
Merge pull request #14 from vbmithr/master

run.local and run.opt.local are now compatible with OPAM usage.