change namespace from SendGridMail to SendGrid, change SendGrid type to SendGridMessage, update to depend on SendGrid.SmtpApi, remove CC and BCC methods since they are not supported in the web API currently.
fix DeliverAsync that was reverted in e2e3087e79f099d7d7330a34f1f3e08c2eb1907b
sign assemblies
version bump
fix some copypasta