Cleaning up the code formatting blocks

Changing "json" to "javascript" so the coloring works better.
Added missing `"` in `require()`.
Merge pull request #2 from pdehaan/patch-1

Cleaning up the code formatting blocks
Numbers and words

Sorry, I think I pushed these to my previous PR after you already merged.
Merge pull request #3 from pdehaan/patch-2

Fix README — Numbers and words
renaming README to a .md file
Merge pull request #4 from pdehaan/readme-md

renaming README to a .md file
First draft of MongoDB proxy for uber-cache-mongodb and getCacheBackend.