add support for Crex24 exchange

lib/database.js

@@ -18,6 +18,7 @@ var mongoose = require('mongoose')
   , ccex = require('./markets/ccex')
   , coinexchange = require('./markets/coinexchange')
   , stex = require('./markets/stex')
+  , crex = require('./markets/crex')
   , coindesk = require('./apis/coindesk');
 
 function find_address(hash, caseSensitive, cb) {
@@ -252,6 +253,11 @@ function get_market_data(market, cb) {
         return cb(err, obj);
       });
       break;
+    case 'crex':
+      crex.get_data(settings.markets.coin, settings.markets.exchange, function (err, obj) {
+        return cb(err, obj);
+      });
+      break;
     default:
       return cb(null);
   }