add redis helper for easily type convert #22
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tototally add 3 files.
Details
3 files: reply.go must.go README.md example/must_example.go (some code from @garyburd redigo)
reply.go: add some useful function to convert []byte to specified type.
must.go: Strict type convert, if err found, just panic., (add MustInt MustString ...(idea from regrexp.MustCompile))
example/* : add examples
README.md update readme with new code description.
PS
Some format are still different from source code, I don't know why, for I already use gofmt.