Merge pull request #17 from mycolorway/conditional_resize

CHG: resize only when target size is differ from FULLSIZE

Author: ksz2k

lib/letter_avatar/avatar.rb

@@ -43,7 +43,7 @@ def generate(username, size, opts = nil)
         fullsize = fullsize_path(identity)
         generate_fullsize(identity) if !cache || !File.exist?(fullsize)
 
-        LetterAvatar.resize(fullsize, filename, size, size)
+        LetterAvatar.resize(fullsize, filename, size, size) if size != FULLSIZE
         filename
       end