provided up navigation from action bar in local trader

Added a parent activity for LtMain in the manifest.
Set "enable home as up" to true, to display the home button in local trader action bar.
Added the use of navutils to navigate up, if home button gets pressed, but commented out, since there is a bug for Android 4.1+ still to be resolved. Added a direct intent to start ModernMainActivity, to function as a workaround until the bug is resolved.