Enhancement: Make the project go-gettable

[christophberger]

The project could be made go-gettable by moving all beneath src/github.com/selvan/turret up to the top level. Then, go get github.com/selvan/turret would clone the project and install the binary in one step (provided that $GOPATH is set).

[selvan]

Now it is go gettable !!. Thanks.