Added BETA opt-in option

-Made SettingsHandler save BETA opt-in preference
-Made Setup load BETA opt-in preference
-Changed program update error message if updateSize == -1 (more specific information)
-Fixed typo in Email.java
-Fixed issue with Email using @mms.att.net as a cell number when a valid email address was specified but no cell number was specified
-Removed main method from Encryption.java
-Reorganized Setup customComponents() code (loading Settings corresponds with element positions in GUI)
-Added Javadocs to small amount of methods in Setup
-Fixed issue with Patch Notes not loading in 1.7.1.3
-Changed version to 1.7.1.4