Removed conflicting dependency. Created highly intermittent failure while deploying in travis-ci.

Details are from http://www.slf4j.org/codes.html#log4jDelegationLoop
The purpose of slf4j-log4j12 module is to delegate or redirect calls made to an SLF4J logger to log4j. The purpose of the log4j-over-slf4j module is to redirect calls made to a log4j logger to SLF4J. If both slf4j-log4j12.jar and log4j-over-slf4j.jar are present on the class path, a StackOverflowError will inevitably occur immediately after the first invocation of an SLF4J or a log4j logger.
Revert "Added trivial unit tests. Will be used to test travis-CI integration."

This reverts commit 295a071fa3d5d6f8c89d578f4b219237a83a2759.
Merge branch 'slf4j-log4j-conflict' of https://github.com/kabexnuf/crowdguru into kabexnuf-slf4j-log4j-conflict