Validate method

[jkav77]

I exposed a validate method on the dynogels model to solve #24. So now you can use the model to validate an instance like below. I included some tests and documentation updates. My tests don't cover many permutations so let me know if there is something that doesn't validate through this method.

const Tweet = dynogels.define({
....
})
const tweet = new Tweet({.....})
Tweet.validate(tweet) // returns { error, value }

[coveralls]

Coverage increased (+0.003%) to 98.659% when pulling 85eca70 on dangerginger:validate-method into 6b3f75c on clarkie:master.

[jkav77]

Actually this does not work. I added a failing test and will look at it later.

[coveralls]

Coverage increased (+0.003%) to 98.659% when pulling fa09840 on dangerginger:validate-method into 6b3f75c on clarkie:master.

[jkav77]

Ok I fixed the tests which were not properly passing an Item object to the validate method which caused false positives and negatives. Then I fixed the validation method and it seems to be working now. I think this solves #24 now.

[coveralls]

Coverage increased (+0.003%) to 98.659% when pulling 9a95fbc on dangerginger:validate-method into 6b3f75c on clarkie:master.

[coveralls]

Coverage increased (+0.007%) to 98.664% when pulling b989888 on dangerginger:validate-method into 6b3f75c on clarkie:master.