ignore kernel object files
added secret_token.rb

I added secret_token.rb file to the gitignore as there are public repos sharing it.
Merge pull request #714 from mattjeffery/ignore_kernel_objects

Ignore kernel object files
Merge pull request #735 from aldo-roman/patch-1

added secret_token.rb
add .xccheckout to Objective-C gitignore

This is a file that Xcode 5 uses for version control, doesn't need to be checked in. Also see http://stackoverflow.com/a/18448100/1877078
Merge pull request #774 from bdewater/patch-1

add .xccheckout to Objective-C gitignore
ensure single trailing newline
Merge pull request #801 from github/fix-trailing-newlines

Ensure single trailing newline