Validate email addresses

Based on https://github.com/sendgridlabs/nibbler-python and https://github.com/sendgrid/ruby_nibbler

go get -u github.com/sendgrid/go_nibbler

import (
	nibbler "github.com/sendgrid/go_nibbler"
)
valid, parsedEmail := nibbler.ParseEmail(email)

1. Fork it ( https://github.com/[my-github-username]/go_nibbler/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request