Added new logo.

[add] wikitrafficking-logo.png (created by: Sally Bolis)
[delete] wikitrafficking-logo.gif (placeholder)
Reflected public changes in LocalSettings.php

[update] LocalSettings--public-log.txt: added variable wgScriptPath in place of hardcoded directory paths. Added favicon.ico.
Merge pull request #5 from jtrein/Task/logo-update

[Task] logo update (self-merge!)