programmatically disable load/save buttons when user is not logged in. Issue #166.
 fix behaviour of "Show/Hide Code" button so that it shows and hides the load, save, and run buttons as well as the actual code editor.
fix issue #161.
Merge pull request #168 from isaacdontjelindell/tooltips

Disabled ActiveCode load/save buttons not actually disabled
Merge pull request #169 from isaacdontjelindell/pg-issue-161

Fix issue #161