Fix Length Allowed for Message to be Tweeted
Fix Length Allowed for Message to be Tweeted

Allocate 30 characters for the url in message.
If message has `{{URL}}`, add 7 character for what will be substituted;
if message doesn't have `{{URL}}`, remove 3 characters for ` - ` in message.

roarkm/school,rails-school/school,roarkm/school,donaldali/school,donaldali/school,roarkm/school,donaldali/school,rails-school/school,rails-school/school