Make going to call log after call optional.

JIRA: CYAN-528
Change-Id: I1cab653e9ac28b767ae3aeebceeaf822d9438b4c
Merge "Make going to call log after call optional." into cm-10.1
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_packages_apps_Phone into cm-10.1