Move the type application_start_type() into cowboy_app.

include/types.hrl

@@ -12,8 +12,5 @@
 %% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 %% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
--type application_start_type() :: normal |
-	{takeover, Node::node()} | {failover, Node::node()}.
-
 -type posix() :: atom().
 -type port_number() :: 0..65535.

src/cowboy_app.erl

@@ -17,6 +17,9 @@
 
 -export([start/2, stop/1]). %% API.
 
+-type application_start_type() :: normal |
+	{takeover, Node::node()} | {failover, Node::node()}.
+
 -include("include/types.hrl").
 
 %% API.