Use latest build tools version.

* Modified build.gradle files for relevant SeriesGuide modules.

Conflicts:
	SeriesGuideBeta/build.gradle
	SeriesGuideFree/build.gradle
Update wrapper to use gradle 1.8.

Conflicts:
	gradle/wrapper/gradle-wrapper.properties
Build X module by default.
Add skeleton for migration activity.
Enable backup functionality in migration assistant.
Remove now unused changes dialog.
Remove changes dialog import from shows activity.
Some tweaks, add launchers to migration activity.
Support up action. Do not show again.
Add Migrate action to top menus.