Made compatible with latest arden. Removed 'force' params from save
method. See #118.

Arden update 1:
https://github.com/laravelbook/ardent/commit/e8e33ebc3f97b909616b6e2128e87652817d02cd
Arden update 2:
https://github.com/laravelbook/ardent/commit/b0e3c36a6256d95cf30c01cb5087fbeb9a0ee0d7
Merge pull request #120 from bio/arden_fix

Made compatible with latest arden. Removed 'force' params from save method. See #118.