Remove Obj-C-specific hmap & ipa from general Xcode template

Global/Xcode.gitignore

@@ -12,5 +12,3 @@ xcuserdata
 profile
 *.moved-aside
 DerivedData
-*.hmap
-*.ipa

Objective-C.gitignore

@@ -23,4 +23,3 @@ DerivedData
 # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control?
 #
 # Pods/
-