[system.memory] Added basic getInfo support for Android
[system.display] Forgot files
[system.display] Removed some compatibility
[system.memory] Fixed doc
[system.display] Fixed docs #2
[system.display] Removed useless import
Fix #236; one too many lines were removed
Merge branch 'chrome.system.display' of https://github.com/beaufortfrancois/mobile-chrome-apps