Added handling of exponents

Slightly better than my last suggestion. Why doesn't git let you edit existing pull requests??

plugins/gcalc.py

@@ -1,6 +1,5 @@
 from util import hook, http
 
-
 @hook.command("math")
 @hook.command
 def calc(inp):
@@ -9,7 +8,11 @@ def calc(inp):
     soup = http.get_soup('http://www.google.com/search', q=inp)
 
     result = soup.find('h2', {'class': 'r'})
+    exponent = result.find('sup')
     if not result:
         return "Could not calculate '%s'" % inp
 
+    if not exponent:
         return result.contents[0]
+    if exponent:
+        return result.contents[0] + "^" + exponent.contents[0]