Merge pull request #6 from codeforboston/beechnut-develop

refactoring and cleanup
Merge pull request #8 from codeforboston/beechnut-develop

Tweet without picture if the picture is nill
Return #my_titleize to its original state. That space after #join makes multi-word capitalization work
Make breed determination concise, and give more responsibilty to Pet. The Pet knows what it wants to say.