std.logger

Logging facilities for Phobos.

Docu:
http://burner.github.io/phobos/phobos-prerelease/std_experimental_logger_core.html
http://burner.github.io/phobos/phobos-prerelease/std_experimental_logger_filelogger.html
http://burner.github.io/phobos/phobos-prerelease/std_experimental_logger_multilogger.html
http://burner.github.io/phobos/phobos-prerelease/std_experimental_logger_nulllogger.html

dub
http://code.dlang.org/packages/logger
1. Please do not use selective imports in global scope: https://issues.dlang.org/show_bug.cgi?id=314
2. back, popBack are now in `std.range.constraints`