Use dynamic handlers

We use dynamic handlers for mango related calls which are:

 - `_index`
 - `_explain`
 - `_find`
diff --git a/src/mango.app.src b/src/mango.app.src
index e1d566d..a63f036 100644
--- a/src/mango.app.src
+++ b/src/mango.app.src
@@ -17,6 +17,7 @@
     {applications, [
         kernel,
         stdlib,
+        couch_epi,
         config,
         couch_log,
         fabric
diff --git a/src/mango_httpd_handlers.erl b/src/mango_httpd_handlers.erl
new file mode 100644
index 0000000..80e5e27
--- /dev/null
+++ b/src/mango_httpd_handlers.erl
@@ -0,0 +1,24 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License.  You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(mango_httpd_handlers).
+
+-export([url_handler/1, db_handler/1, design_handler/1]).
+
+url_handler(_) -> no_match.
+
+db_handler(<<"_index">>)        -> fun mango_httpd:handle_req/2;
+db_handler(<<"_explain">>)      -> fun mango_httpd:handle_req/2;
+db_handler(<<"_find">>)         -> fun mango_httpd:handle_req/2;
+db_handler(_) -> no_match.
+
+design_handler(_) -> no_match.
diff --git a/src/mango_sup.erl b/src/mango_sup.erl
index f9d0e22..7f4cd10 100644
--- a/src/mango_sup.erl
+++ b/src/mango_sup.erl
@@ -22,4 +22,5 @@
 
 init([]) ->
     {ok, {{one_for_one, 3, 10}, [
+        chttpd_handlers:provider(mango, mango_httpd_handlers)
     ]}}.