Freeze mongodb dependency

Tests demonstrate that there is some sort of inconsistency
when retrieving records from the database on the mongodb driver
version >= 1.1.2. Some times the tests pass,
and some times the tests don't pass.

For more info, refer to the following tests where it is breaking:

- http://travis-ci.org/#!/derdesign/protos/builds/2132289/L2422
- http://travis-ci.org/#!/derdesign/protos/builds/2126680/L2351
- http://travis-ci.org/#!/derdesign/protos/builds/2126509/L2400
- http://travis-ci.org/#!/derdesign/protos/builds/2126339/L2328

dependencies.json

@@ -1,6 +1,6 @@
 {
   "mongodb": {
-    "mongodb"             : ">= 1.1.2"
+    "mongodb"             : "= 1.0.2"
   },
   "mysql": {
     "mysql"               : ">= 0.9.6"