Provide SLF4J binding when running command line application

[comeara]

When running the command line, SLF4J outputs the following.

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

The command line app should bind SLF4J such that log messages are output correctly.

This should be done in a way that does not conflict with SLF4J bindings for applications that include Pillar as a library.