Change "schwag" to "swag"

There is some debate on it, but from my experience running conferences,
everyone understands 'swag'[0] and lots of people read 'schwag' as slang
for marijuana[1], which I don't believe we're currently selling.

[0] http://english.stackexchange.com/questions/45189/free-stuff-swag-or-schwag
[1] http://www.urbandictionary.com/define.php?term=schwag
Merge pull request #155 from SlexAxton/slexaxton-schwag

Change "schwag" to "swag"