OClint: fix parsing.
OClint: slightly more robust regexps.
Fix bad variable initialization

Previously, non-core users could not use ocamlc as their syntax checker because this check would reset the wrong variable. 
Setting g:syntastic_ocaml_use_ocamlc without core now works as intended.
Merge pull request #1161 from dtwitty/patch-1

camlp4o: fix bad variable initialization.
Allow oclint to use cmake compilation databases.
Add support for maven customizations