Validate that locals do not include dots. Fixes #36

[pjmartorell]

• Resolves Dots in GMail addresses #36
• Add disallow_dotted option to enable validation of locals with dots
• Add dotted? method to check if a local includes a dot

[firefart]

Shouldn't we add this case to subaddressed? too?

[pjmartorell]

@firefart having it in a separate option allows more flexibility and does not create a breaking change with the current behavior

[micke]

Thanks @pjmartorell
I was under the impression that if you register a gmail address with a dot in it, that you don't get the undotted version too.

[micke]

I just pushed version 3.2.0 to rubygems!

[pjmartorell]

thanks, @micke!