Added support for charset in css_include_tag
Added support for charset in css_include_tag

Added support for the charset attribute in the css_include_tag helper of merb-assets. It will
Now default to utf-8. To change the charset, pass :charset to the helper.

Examples:

css_include_tag 'style'
=> <link href="/stylesheets/style.css" media="all" rel="Stylesheet" type="text/css" charset="utf-8" />

css_include_tag 'style', :charset => 'iso-8895-1'
=> <link href="/stylesheets/style.css" media="all" rel="Stylesheet" type="text/css" charset="iso-8895-1" />

Signed-off-by: Ezra Zygmuntowicz <4aca359fa1b78e51bc8226c4f161d16fdc1e21c8@engineyard.com>

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