Added ability to have wildcards for custom_headers
Fog must be >= 1.8 to allow setting of Access-Control-Allow-Origin header - can't set random headers though
Matching on just the regular expression, not a whole path prefixed with the asset_path
Merge branch 'andyjeffries-wildcard_custom_headers'

Conflicts:
	asset_sync.gemspec
remove rspec deprecated expect { }.not_to raise_error(SpecificErrorClass) in favour of raise_error()