Disambiguate between boost::ref and std:ref etc.

Suppress some new warnings from VC-10.
Fix singular iterator logic (fixes VC-10 failures).
Fixes #4114.
Fixes #3632

[SVN r61430]

libs/regex

@@ -1 +1 @@
-Subproject commit 67f5369cae0fcd02b39779a1484f2c4f56239a50
+Subproject commit a2142edcd3c4335faf02f5ef3c0577d6611cb1ea