Issue #1148724 by willvincent: Fixed php 5.3 strict warning when node_load does not return a node object.

Issue #1121930 by willvincent: Truncating node titles when sharing to twitter can produce invalid unicode. Added option to not truncate node titles to admin settings form.

General code cleanup, removed extraneous conditional value checks where the evaluation is simply a True/False check.

Issue #1121930 by willvincent: Added an admin setting to choose between classic twitter share method and new url sharing method.

Issue #1119058 by willvincent: Makes use of URL shortening service if the 'shorten' module is installed and enabled.

Issue #1108016 by danlinn, (backported by willvincent): Make links available in block, add admin setting to make block available, handle content types without body fields.