Strip new lines, simple config, docs update

• Support for simple config, documentation update
• Strip trailing newlines from edited text
• Bail out if no file selected with --list [fix #5]
• Document the Ctrl-Shift-V keyboard shortcut

New options, one key stroke less!

• Document new options, some adjustments
• New option --last, some reorganization [fix #1]
• Work around RHEL7 zenity bug [BZ#1060471]
• Use the primary mouse selection first [fix #2]
• Option --list, fixing issue #3

Initial packaging

The first edd package ever.