form OnSubmit trigger on click of any pell formatting button inside form.

[cyberSane]

Hi @jaredreich,

I kept the pell editor inside a form which have an onSubmit event handler on it. While I click on any of the formatting button the form onSubmit got called.
The only workaround I got it to check the event inside the onSubmit method.

I wonder if this can be correctly handled in the pell.

I will raise a PR with the solution which I think of.

[cyberSane]

I have raised a PR - #150.
Please have a look.