Add the logistic_distribution as an extension.

Add the logistic_distribution as an extension.

2014-07-11  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Add the logistic_distribution as an extension.
	* include/ext/random: Add the logistic_distribution.
	* include/ext/random.tcc: Add the logistic_distribution.
	* testsuite/ext/random/logistic_distribution/cons/parms.cc: New.
	* testsuite/ext/random/logistic_distribution/cons/default.cc: New.
	* testsuite/ext/random/logistic_distribution/requirements/typedefs.cc:
	New.
	* testsuite/ext/random/logistic_distribution/operators/inequal.cc: New.
	* testsuite/ext/random/logistic_distribution/operators/equal.cc: New.
	* testsuite/ext/random/logistic_distribution/operators/serialize.cc:
	New.

From-SVN: r212476