flutter init should gitignore .atom
flutter init should gitignore .atom

We now create a .atom folder to hold settings for the Atom project. We
should gitignore that folder our project template.

aghassemi/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter,Hixie/flutter,aghassemi/flutter,Hixie/flutter,flutter/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,flutter/flutter,cbracken/flutter,Hixie/flutter,flutter/flutter,cbracken/flutter,aghassemi/flutter,tvolkert/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,cbracken/flutter,flutter/flutter,Hixie/flutter,turnidge/flutter,turnidge/flutter,tvolkert/flutter,cbracken/flutter,turnidge/flutter,aghassemi/flutter,Hixie/flutter,flutter/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,tvolkert/flutter,tvolkert/flutter,cbracken/flutter,turnidge/flutter,tvolkert/flutter,Hixie/flutter,turnidge/flutter,tvolkert/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,cbracken/flutter,tvolkert/flutter