A few changes to API for better Wrapped component support

[track0x1]

This is a continuation of #470.

• Added Formsy.propTypes to API documentation
• Moved innerRef section in docs to match location on table of contents
• Change HOC to Wrapper to be consistent with naming throughout the repo
• The mixin version of Formsy allowed you to set a default value via defaultProps. This change will essentially hoist your component's defaultProps.value (if it exists) to Formsy.Wrapper to maintain this functionality.
• Add optional parameter to setValue() to disable validation. default: setValue(value), new: setValue(value, false) will prevent validation. This was possible with the mixin version of Formsy because the state was mixed into your input component. (You could do this.setState({ _value: .. });)
• Update prepublish script to wipe /lib. Better to start the build folder clean!

[aesopwolf]

Thanks for this. I started testing the beta branch this morning. I'll open a PR with a few tweaks of my own and let you review, then if all is good we can publish v1

[track0x1]

Awesome, sounds good @aesopwolf!