Implement class regex_traits.

2013-07-09  Tim Shen  <timshen91@gmail.com>

	Implement class regex_traits.
	* include/bits/regex.h: Implement lookup_classname and
	lookup_collatename; modify isctype; partially implement
	transform_primary.
	* testsuite/28_regex/traits/char/isctype.cc: Add more test cases.
	* testsuite/28_regex/traits/char/lookup_classname.cc: Likewise.
	* testsuite/28_regex/traits/char/lookup_collatename.cc: Likewise.
	* testsuite/28_regex/traits/char/transform_primary.cc: Likewise.
	* testsuite/28_regex/traits/wchar_t/isctype.cc: New.
	* testsuite/28_regex/traits/wchar_t/lookup_classname.cc: New.
	* testsuite/28_regex/traits/wchar_t/lookup_collatename.cc: New.
	* testsuite/28_regex/traits/wchar_t/transform_primary.cc: New.

From-SVN: r200818