update the build archs to the newer Xcode defaults

git-svn-id: http://gtm-oauth2.googlecode.com/svn/trunk/Source@125 22754eea-fc93-e339-b032-c1f495b90c16
Allow subclasses of GTMOAuth2ViewControllerTouch to override the methods that swap out and in the cookies.


git-svn-id: http://gtm-oauth2.googlecode.com/svn/trunk/Source@126 22754eea-fc93-e339-b032-c1f495b90c16