Revert "use all in lib, restrict to relay in app"

This reverts commit b268c7fdc5.

app.js

         // for chrome, add multistream cap
     }
     connection.jingle.pc_constraints = RTC.pc_constraints;
-    connection.jingle.ice_config.iceTransports = 'relay';
     if (config.useIPv6) {
         // https://code.google.com/p/webrtc/issues/detail?id=2828
         if (!connection.jingle.pc_constraints.optional) connection.jingle.pc_constraints.optional = [];

libs/strophe/strophe.jingle.js

     connection: null,
     sessions: {},
     jid2session: {},
-    ice_config: {iceServers: [], iceTransports: 'all'},
+    ice_config: {iceServers: [], iceTransports: 'relay'},
     pc_constraints: {},
     media_constraints: {
         mandatory: {