Ignore build files

Conflicts:

	CordovaLib/CordovaLib.xcodeproj/xcuserdata/apigee.xcuserdatad/xcschemes/CordovaLib.xcscheme
	CordovaLib/CordovaLib.xcodeproj/xcuserdata/apigee.xcuserdatad/xcschemes/xcschememanagement.plist
	Targets.xcodeproj/xcuserdata/apigee.xcuserdatad/xcschemes/Targets.xcscheme
	Targets.xcodeproj/xcuserdata/apigee.xcuserdatad/xcschemes/xcschememanagement.plist