Merge pull request #28 from rayshih/master

now you can load a non-mongoose related model by Model
- pdate packages] mongoose->3.6.20, thunder->0.1.9
v0.16.3
[bug fix] Model loading sequence
[update packages] js-yaml->2.1.1
v0.16.4
move loading mongoose model out
minor change
[update packages] inflection->1.3.2, js-yaml->2.1.3, moment->2.4.0, mongoose->3.8.1, node.class->1.1.1, node.packer->2.0.3, rmdir->1.0.2, should->2.1.1, sitemap->0.7.1
v0.16.5
minor change
[bug fix] Pass `Error` to next filter instead of jump out of stack; [refactoring] Use instance var instead of `this`
v0.16.6
update js-yaml
v0.17.0
[update packages] node.class->1.1.2
v0.17.1
[update packages] node.class->1.1.3
v0.17.2
[update packages] node.class->1.1.4