Downloads remote files if passed a URL

```
csscss http://localhost:8080/stylesheets/application.css
```

Author: zmoazeni

lib/csscss.rb

@@ -1,6 +1,7 @@
 require "stringio"
 require "optparse"
 require "json"
+require "open-uri"
 
 require "colorize"
 require "parslet"

lib/csscss/cli.rb

@@ -15,8 +15,7 @@ def run
     def execute
 
       all_redundancies = @argv.map do |filename|
-        contents = case File.extname(filename).downcase
-        when ".scss", ".sass"
+        contents = if %w(.scss .sass).include?(File.extname(filename).downcase) && !(filename =~ URI.regexp)
           begin
             require "sass"
           rescue LoadError
@@ -26,7 +25,7 @@ def execute
 
           Sass::Engine.for_file(filename, {cache:false}).render
         else
-          File.read(filename)
+          open(filename) {|f| f.read }
         end
 
         RedundancyAnalyzer.new(contents).redundancies(@minimum)