New .gitignore; Add .DS_Store; Remove CocoaPods.

.gitignore

@@ -16,5 +16,17 @@ DerivedData
 *.hmap
 *.ipa
 *.xcuserstate
-*.DS_Store
 .DS_Store
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
+Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+Carthage/Checkouts
+Carthage/Build