Updates /platforms/ directory

Updates /platforms/ directory to latest cordova build type.
Removes platforms/ios/www directory

www in /platforms/ is not needed to build the project. This commit
removes the directory.
Updates gitignore

Adds platforms www directory to gitignore because it’s generated
automatically when building the project.
Merge pull request #65 from codeforamerica/update-platforms

Update platforms

Thanks for the your persistence!