Added SVG to supported files. Tests pass. 
Added SVG to supported files. Tests pass. 
rstacruz/sinatra-assetpack,rstacruz/sinatra-assetpack,rstacruz/sinatra-assetpack,jwhitcraft/sinatra-assetpack,jwhitcraft/sinatra-assetpack,flywithmemsl/sinatra-assetpack,flywithmemsl/sinatra-assetpack,jwhitcraft/sinatra-assetpack,flywithmemsl/sinatra-assetpack