Rename mw.uri to mw.Uri + minor fixes:
- Renaming mw.uri to mw.Uri (since it's a constructor)
- Leaked global variable 'g' in _parse() fixed
- Removing unused local variable '_this' in getQueryString()
- Fix documentation (jQuery 'setAttr' should be 'attar')
- Making non-private variables with '@private' comment, private (or "local").
- Using strict undefined comparison (shorter and faster, [[JSPERF]])
- Moving Resources definition from MediaWiki Page section to MediaWiki main section (to reflect directory structure)
- Coding style conventions (mixed spaces and tabs, line wrapping, double/single quotes)
- Remove passing mediaWiki to mw argument (mw is a global alias)
- Passes JSHint
- Removing 404 errors from UploadWizard/test/jasmine/SpecRunner.html
(Follows-up r93781 's move)