Remove code that falls back to attempting to initialize session store…

… w/ `express` (rather than `express-session`)

This code was there to support Express 3-compatible session adapters, and we don't have Express 3 anymore.

lib/hooks/session/index.js

@@ -219,33 +219,25 @@ module.exports = function(app) {
               try {
                 CustomStore = SessionAdapter(require('express-session'));
                 app.config.session.store = new CustomStore(app.config.session);
-              } catch (rawErr) {
-                // If that fails, attempt to initialize the adapter using express
-                // (required by older session adapters)
-                try {
-                  CustomStore = SessionAdapter(require('express'));
-                  app.config.session.store = new CustomStore(app.config.session);
-                }
-                catch (unused) {
-
-                  // Failed attempting to initialize adapter; output a message w/ error info
-                  // TODO: negotiate error and give better error msg depending on code
-                  return cb(new Error(
-                    'Encountered error in the installed version of `' + app.config.session.adapter + '` (a session adapter).\n'+
-                    'Raw error from the session adapter:\n'+
-                    '---\n'+
-                    (function _getAppropriateMessageFromRawSessionAdapterErr(){
-                      if (_.isError(rawErr)) { return rawErr.stack; }
-                      else if (_.isString(rawErr)) { return rawErr; }
-                      else { return util.inspect(rawErr, { depth: null }); }
-                    })()+'\n'+
-                    '---\n'+
-                    '\n'
-                  ));
-
-                }//</catch :: failed to instantiate session adapter by passing in express-session AND by passing express!>
-              }//</catch :: failed to instantiate session adapter by passing in express-session>
-
+              }
+              catch (unused) {
+
+                // Failed attempting to initialize adapter; output a message w/ error info
+                // TODO: negotiate error and give better error msg depending on code
+                return cb(new Error(
+                  'Encountered error in the installed version of `' + app.config.session.adapter + '` (a session adapter).\n'+
+                  'Raw error from the session adapter:\n'+
+                  '---\n'+
+                  (function _getAppropriateMessageFromRawSessionAdapterErr(){
+                    if (_.isError(rawErr)) { return rawErr.stack; }
+                    else if (_.isString(rawErr)) { return rawErr; }
+                    else { return util.inspect(rawErr, { depth: null }); }
+                  })()+'\n'+
+                  '---\n'+
+                  '\n'
+                ));
+
+              } //</catch :: failed to instantiate session adapter by passing in express-session>
             } catch(rawRequireErr) {
 
               // If an error occurred while attempting to require() the adapter, include