Prioritizing macros above other inline patterns (#223)

Previously, including an inline pattern within a macro breaks the whole process; this is untenable, since it means that escaping a character in an argument renders it wholly unworkable.

infogami/utils/macro.py

@@ -155,7 +155,7 @@ def replace_macros(html, macros):
 
 class MacroExtension(markdown.Extension):
     def extendMarkdown(self, md, md_globals):
-        md.inlinePatterns.append(MacroPattern(md))
+        md.inlinePatterns.insert(0, MacroPattern(md))
         md.macro_count = 0
         md.macros = {}