add AddMulti() client interface and implementation
Merge pull request #45 from adegtiar/memcache_add

add AddMulti() client interface and implementation
Update README.md

Adding Alex Degtiar to contributors
Add lock/unlock statement support
Add comments and use interface inheritance in Statement
Run gofmt
Add more comments
Merge pull request #46 from rajatgoel/add-lock-unlock-statements

Add lock/unlock statement support
changes
Merge pull request #47 from 4578395263256/url

Add Proxy field to ConnectionParams.
Update README.md