Fix bug: clear md5 ArrayList when finished md5 calculation

[git-p4: depot-paths = "//xFace-Apollo/branches/openxface-android/": change = 17545]
Add param description of js method "startNativeApp" in app.js

[git-p4: depot-paths = "//xFace-Apollo/branches/openxface-android/": change = 17546]
Support https protocol in "navigator.app.openUrl" extension method

[git-p4: depot-paths = "//xFace-Apollo/branches/openxface-android/": change = 17547]