Fixed some major bugs with implications, cleaning up the cache

expiration process and adding some additional tests.

Cleaned up the unit tests.  They should all run cleanly with rake
test:units now.

Gemfile.lock

@@ -58,10 +58,13 @@ GEM
       i18n (~> 0.4.1)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
+    mechanize (1.0.0)
+      nokogiri (>= 1.2.1)
     memcache-client (1.8.5)
     mime-types (1.16)
     mocha (0.9.9)
       rake
+    nokogiri (1.4.3.1)
     pg (0.9.0)
     polyglot (0.3.1)
     rack (1.2.1)
@@ -102,8 +105,10 @@ DEPENDENCIES
   ffaker!
   haml
   imagesize
+  mechanize
   memcache-client
   mocha
+  nokogiri
   pg
   rails (= 3.0.0)
   shoulda