Update gitignore.

.gitignore

@@ -1,15 +1,34 @@
+## OS X
 .DS_Store
 
-*.pbxuser
-*.perspective
-*.perspectivev3
+## Build generated
+build/
+DerivedData
 
+## Various settings
+*.pbxuser
+!default.pbxuser
 *.mode1v3
+!default.mode1v3
 *.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
 
-*.xcodeproj/xcuserdata/*.xcuserdatad
-
+## Other
 *.xccheckout
-*.xcuserdatad
+*.moved-aside
+*.xcuserstate
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+
+## Dependency Managers
+Pods/
+Carthage/Build
 
-Pods
+## AppCode
+.idea/