README: Fix broken URLs

Change-Id: Ie25ad7483cd55c398d6c9b8be3b8785754c31fa4
Merge "README: Fix broken URLs" into cm-10.1
Merge branch 'cm-10.1' of github.com:CyanogenMod/android into cm-10.1

Conflicts:
	README.mkdn

Change-Id: Ice7f2ce720c91be7868132744f47bc3c181aaed9