Do not show send email option if no activities can handle mailto

Change-Id: I6975ba9f69081a11d565e13b52a0504639969798
Remove unnecessary import in MessageUtils

Change-Id: I07a607fb1a5d5f025d97f567026a33b86fbd4759
Revert "Mms: Enable smsc preference by default."

This reverts commit 5eb28bbd58453fc3581d545c1314cab6e1afd219.

Change-Id: Ic23f7e81d84adffe203ac3d92b3661d2c451cdb2
Merge branch 'cm-12.0' of https://github.com/CyanogenMod/android_packages_apps_Mms-caf into cm-12.0