Update .gitignore, check in .xcworkspace

The original .gitignore was outdated, and was preventing the workspace from being added to the repo.

Author: smileyborg

.gitignore

@@ -1,6 +1,12 @@
 # Xcode
-.DS_Store
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
 build/
+DerivedData
+
+## Various settings
 *.pbxuser
 !default.pbxuser
 *.mode1v3
@@ -9,10 +15,29 @@ build/
 !default.mode2v3
 *.perspectivev3
 !default.perspectivev3
-*.xcworkspace
-!default.xcworkspace
 xcuserdata
-profile
+
+## Other
+*.xccheckout
 *.moved-aside
-DerivedData
-.idea/
+*.xcuserstate
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+
+# 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-check-the-pods-directory-into-source-control
+#
+#Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build