issue #21 : js + common will be publisher in version 1.5.5

add common and js jars (will be in https://github.com/MicroUtils/kotlin-logging/releases)
common module have expect for 2 main classes: KotlinLogging, KLogger
js implementation includes writing to console,
and a class KotlinLoggingLevel that defines the log level in LOG_LEVEL member
default level is info for js implementation