Improve builds to be installable and linkable across projects, make sure tests aren't built for dependencies, remove libcrypto from polluting the build interface.

Update deps fix cmake templates (#94)

* Updated dependencies to latest, fixed cmake template files.

* Don't need the finder module updates anymore.

* Update aws-c-io for new libcrypto dependency mess, and pull in some minor bug fixes from s2n.

* Make sure tests don't get built accidentally this time.