Add module to find Erlang compiler and runtime

Change-Id: I224c4275eb72df9714ad15f5bb8562107023fcc7
Reviewed-on: http://review.couchbase.org/33905
Reviewed-by: Nimish Gupta <nimish@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>