Ignore gemfile.lock

Author: Peter Benjamin

.gitignore

@@ -42,7 +42,7 @@ build-iPhoneSimulator/
 
 # for a library or gem, you might want to ignore these files since the code is
 # intended to run in multiple environments; otherwise, check them in:
-Gemfile.lock
+# Gemfile.lock
 # .ruby-version
 # .ruby-gemset