Fixed bytecode cache and added support for memcached (tests still missing)

--HG--
branch : trunk
diff --git a/jinja2/__init__.py b/jinja2/__init__.py
index f7576d1..0a3ff6f 100644
--- a/jinja2/__init__.py
+++ b/jinja2/__init__.py
@@ -41,7 +41,8 @@
      DictLoader, FunctionLoader, PrefixLoader, ChoiceLoader
 
 # bytecode caches
-from jinja2.bccache import BytecodeCache, FileSystemBytecodeCache
+from jinja2.bccache import BytecodeCache, FileSystemBytecodeCache, \
+     MemcachedBytecodeCache
 
 # undefined types
 from jinja2.runtime import Undefined, DebugUndefined, StrictUndefined