porting #668 to 1.6.x
Fixed load_resource "find_by" in mongoid resources

Latest versions of Mongoid supports "find_by" query, but syntax
is slightly different than Active Record.
Working around CVE-2012-5664
Creating a Project here is unnecessary
added support for nested join conditions
Add docs for id_param option of load_resource

Added in https://github.com/ryanb/cancan/pull/425 but lacked documentation
Merge pull request #800 from wopata/master

Working around a SQL Injection Vulnerability in Ruby on Rails (CVE-2012-5664)
Merge pull request #806 from yuszuv/support_for_nested_joins

added support for nested join conditions
Merge pull request #705 from albertobajo/mongoid_find_by

Fixed load_resource "find_by" in mongoid resources
Merge pull request #728 from zephyr-dev/patch-1

Add docs for id_param option of load_resource
Merge pull request #675 from bukalapak/master

porting #668 to master branch
fix matches_conditons_hash for string values on 1.8
releasing 1.6.10
Merge branch 'master' into strong_parameters