Use a struct for IRC lines, clean up code a bit

CHANGES.md

@@ -1,6 +1,7 @@
 * Use `Set` instead of `Array` where appropriate
-* Allow trailing `\r\n` or `\n` in arguments to `#parse` and `#decompose_line`
+* Allow trailing `\r\n` or `\n` in arguments to `#parse` and `#decompose`
 * Call `#inspect` on unsupported protocol lines
+* Used a struct to represent IRC protocol lines and simplified some code
 
 0.2.0   Mon Dec 3 18:27:18 2012 +0000
 -----

lib/ircsupport/masks.rb

@@ -28,7 +28,7 @@ def matches_mask(mask, string, casemapping = :rfc1459)
     end
 
     # Match strings to multiple IRC masks.
-    # @param [Array] mask The masks to match against.
+    # @param [Array] masks The masks to match against.
     # @param [Array] strings The strings to match against the masks.
     # @param [Symbol] casemapping The IRC casemapping to use in the match.
     # @return [Hash] Each mask that was matched will be present as a key,