console appender holds a reference to the writer
can log to stderr with ToStderr()
compat initial dev complete. all tests pass
updated license info for files that contain Go source code
fix for source line-dependent test
changed package-level Fatal* functions to GoFatal*
added godoc documentation for Go stdlib log interface, methods
updated readme with instructions on how to upgrade from Go's std logger
changed name of consoleAppender to writerAppender and added lock