Remove Wordnik.

This reverts commit 89f4b9efdb553f7a5b447d38f1017b6fa1a973bc.
This reverts commit 968790915d89125c94627672cfd732ef0a6bd97e.
This reverts commit 71448825c2dacf4baecab316beecd27a5c1425a7.
This reverts commit 88dda29c552c16e4325a6cb93ae1dc347af5897d.
This reverts commit b046a699f189644fe73c120c5c0f0546bcc71df4.