Error when trying to test Craft Pro on .dev
I found a solution! I had my local environment setup with homebrew following this article's instructions. After looking at the php error logs, I uncommented always_populate_raw_post_data = -1 in the php.ini file found in /usr/local/etc/php/5.6.

I then restarted the brew services with brew services restart php56 (install brew services by tapping gapple/services with brew tap gapple/services) and restarted apache with apachectl restart. 

That did the trick!