v0.0.4 Add Plugin support. Add replaceParamsInHash plugin

add test for required methods: "listen", "reset"

remove old code. add some comments

add tools

Add test and fix bug on ProxyServer#reset

add replace params plugin

use tools.getHash

add test for plugin function

Fix test. Complite test :)

add test for plugins#replaceParamsInHash

add plugins#replaceParamsInHash