message: Fix redox namespaces plugin
diff: +use fnv::FnvHashMap;
  +
  use types::Identifier;
  use super::NamespaceError;
  -pub struct StringNamespace {}
  +pub struct StringNamespace;
  impl StringNamespace {
  - pub fn new() -> Result<StringNamespace, NamespaceError> { Err(NamespaceError::FunctionMissing) }
  + pub fn new() -> Result<StringNamespace, NamespaceError> { Ok(StringNamespace) }
  pub fn execute(&self, function: Identifier) -> Result<Option<String>, NamespaceError> { Ok(None) }
  }
  pub fn collect() -> FnvHashMap<Identifier, StringNamespace> {
  eprintln!("ion: Redox doesn't support plugins yet");
  - let mut hashmap = FnvHashMap::default();
  - hashmap
  + FnvHashMap::default()
  }
  