Only include mongoc-ssl.h when built with SSL
Merge pull request #52 from bjori/patch-1

Only include mongoc-ssl.h when built with SSL
client-pool: put ssl opts in #ifdef.
gridfs: add mongoc_gridfs_remove_by_filename()
gridfs: include bulk operation header.
gridfs: fix potential uninitialized use.
Release 0.96.4!
git: fix a release oopsie.

However, not totally a bad idea to include these like this.
Post release bump.
client: nullify sock by default.
php: add prototype php binding for libmongoc-1.0.

This is an experiment in writing PHP bindings for C libraries.
bson: allow encoding of arrays.
php: add some examples