2013-09-03  Tim Shen  <timshen91@gmail.com>

	* include/bits/regex_automaton.h: Add dummy node type. Rewrite
	  _StateSeq.
	* include/bits/regex_automaton.tcc: Implement them.
	* include/bits/regex_compiler.h: Rewrite _Compiler to use new
	  _StateSeq interfaces.
	* include/bits/regex_compiler.tcc: Implement them.
	* include/bits/regex_scanner.h: Add word boundry assertion token.
	* include/bits/regex_scanner.tcc (_Scanner<>::_M_eat_escape_ecma):
	  Support word boundry.
	* testsuite/28_regex/algorithms/regex_match/basic/string_range_02_03.cc
	  : Remove "xfail".
	* testsuite/28_regex/algorithms/regex_match/extended/cstring_plus.cc:
	  Likewise.
	* testsuite/28_regex/algorithms/regex_match/extended/
	  string_range_02_03.cc: Likewise.
	* testsuite/28_regex/algorithms/regex_match/extended/
	  cstring_questionmark.cc: Remove xfail and get correct length of
	  c-string.
	* testsuite/28_regex/algorithms/regex_match/extended/
	  string_range_00_03.cc: Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/char/quoted_char.cc:
	  New.
	* testsuite/28_regex/algorithms/regex_match/extended/cstring_range.cc:
	  New.