Major changes!

Refactored log4jv1 code base quite heavily
Added logbackv1 appender and layout
Created abstract layouts to use with any logging framework:
* logstashv1
* logstashv0 (original)
* gelfv1 (greylog2 - needs some work)
Upped version number to 0.1.0!
Added details to README
Can now specify what log level to print extra details in config. See #2

Cheers :)