Fix Helloworld Cordova README
Fix Contacts Mobile Cordova README
Improved Android README files to show the need to install two platform SDK version: latest  and 19. Current wording is not clear about that fact
Change compile version of Android to 21 to fix compilation issues.
Merge branch 'readme-fix' of https://github.com/stribny/jboss-mobile-quickstarts into stribny-readme-fix
Updated README.html files