Synced gitignores with github repo (#1245)

* Renamed scripts directory into contrib

* Added script to download gitignores from github

* Synced gitignores with github repo

options/gitignore/Xcode

@@ -4,7 +4,7 @@
 
 ## Build generated
 build/
-DerivedData
+DerivedData/
 
 ## Various settings
 *.pbxuser
@@ -15,9 +15,9 @@ DerivedData
 !default.mode2v3
 *.perspectivev3
 !default.perspectivev3
-xcuserdata
+xcuserdata/
 
 ## Other
-*.xccheckout
 *.moved-aside
-*.xcuserstate
+*.xccheckout
+*.xcscmblueprint