updating gitignore, adding workspace to wxcocoa_in

.gitignore

@@ -84,10 +84,8 @@
 /build/msw/.vs/
 
 # /build/osx
-**/*.xcodeproj/*
-!**/*.xcodeproj/project.pbxproj
-!**/*.xcodeproj/xcshareddata/
-!**/*.xcworkspace/contents.xcworkspacedata
+**/xcuserdata/
+**/DerivedData/
 /build/osx/build
 /build/osx/setup/cocoa/include/wx/setup.h
 /build/osx/setup/iphone/include/wx/setup.h

build/osx/wxcocoa_in.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:wxcocoa.xcodeproj">
+   </FileRef>
+</Workspace>