Generate 'log4j.properties' from template, since Solr >= 4.3 defaults to using log4j as its SLF4J implementation.
Clean-up trailing white-space.
Add entry for 'log4j.properties' to change log.
Merge pull request #23 from SalesSeek/log4j-properties-generation

Add support for generating 'log4j.properties' file from template.