Merge pull request #2 from xStrom/master

Fixed a common race condition regarding memcache usage.
Merge pull request #3 from xStrom/master

No longer polluting the cache with empty results from keys-only queries.
Add a missing g.error
Ignore memcache errors

I'm not sure what was happening before this, but I think it was broken.
Missed fmt import
Minor typo in readme
Merge pull request #1 from mjibson/master

Syncing with mjibson