Add awful hack to support broken namespaces

This works around the fact that `load` (upon which `require` depends)
calls `remove-ns` if the first attempt to load an ns fails.

plugin/fireplace.vim

@@ -191,11 +191,12 @@ function! s:repl.preload(lib) dict abort
  let self.requires[a:lib] = 0
  let clone = s:conn_try(self.connection, 'clone')
  try
- let result = clone.eval('(ns '.self.user_ns().' (:require '.a:lib.reload.'))', {'ns': self.user_ns()})
+ let result = clone.eval("(#'clojure.core/load-one \"" . a:lib . "\" true true)", {'ns': self.user_ns()})
+ let ns_exists = clone.eval("(the-ns '" . a:lib . ")", {'ns': self.user_ns()})
  finally
  call clone.close()
  endtry
- let self.requires[a:lib] = !has_key(result, 'ex')
+ let self.requires[a:lib] = !has_key(ns_exists, 'ex')
  if has_key(result, 'ex')
  return result
  endif