Avoid 'reference to reference' error in C++03.

  Some (strict) C++03 compilers (e.g. `gcc -std=c++03`) reject
  'reference-to-reference' in the template and typedef which described
  in CWG DR106 [1].

  In such situations, iterator_facade rejects reference type as a value
  type and some special iterators will become ill-formed:
  the test libs/range/test/join.hpp might be descriptive.

  [1] http://www.open-std.org/Jtc1/sc22/wg21/docs/cwg_defects.html#106

Signed-off-by: Kohei Takahashi <flast@flast.jp>
Merge pull request #10 from Flast/pr/ref-to-ref/dr106

Avoid 'reference to reference' error with strict C++03 compiler.

While I can't reproduce the error you describe, the patch looks good and it tested okay with Clang 6.0 on Mac and gcc-4.9.1 on Linux.  Thanks for the patch.