Not possible to append parameters to urls
When adding a paramater to the url HttpBeast parse the `?` and returns a 404. When `-d:dev` is defined HttpBeast crash, while in `-d:release` it just returns 404.


Reference: [Jester issue 146](https://github.com/dom96/jester/issues/146)

**Use case**
When appending `?username=nimmer` to the first route, the route will never be reached due to HttpBeast parses the `?`.
```nim
import jester, asyncdispatch

routes:
  get "/projects/all":
    if @"username" == "nimmer":
       resp("OK")

  get "/projects/@projectid":
    if @"projectid" == "1": 
      resp("You have access")
    else:
      resp("No access")
```

**Error**
```nim
INFO Jester is making jokes at http://0.0.0.0:5000
Starting 1 threads
DEBUG GET /page2
DEBUG   200 OK Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style.css
DEBUG   304 Not Modified None[RawHeaders]
DEBUG   TCActionNothing
DEBUG GET /style2.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style3.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style4.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style5.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style6.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style7.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style8.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style9.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style10.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
DEBUG GET /style11.css?
DEBUG   404 Not Found Some(@[(key: "Content-Type", val: "text/html;charset=utf-8")])
paramurl.nim(3)          paramurl
jester.nim(462)          serve
httpbeast.nim(412)       run
httpbeast.nim(292)       eventLoop
asyncdispatch.nim(1511)  poll
asyncdispatch.nim(1277)  runOnce
asyncdispatch.nim(183)   processPendingCallbacks
asyncfutures.nim(216)    :anonymous
httpbeast.nim(212)       :anonymous
system.nim(3753)         failedAssertImpl
system.nim(3746)         raiseAssert
system.nim(2807)         sysFatal
Error: unhandled exception:
0 < len(data.sendQueue) - sendQueueBefore Request needs a response. [AssertionError]
```

**Test code**
```nim
import jester, asyncdispatch

routes:
  get "/page2":
    var html = "<h1>H1</h1><br>"
    html.add("<h2>H2</h2>")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style.css\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style2.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style3.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style4.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style5.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style6.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style7.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style8.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style9.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style10.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style11.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style12.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style13.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style14.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style15.css?v=123\">")
    html.add("<link rel=\"stylesheet\" type=\"text/css\" href=\"style16.css?v=123\">")
    resp(html)

runForever()
```


