add slf4j-log4j12 to tika-dl.  Thank you, Oleg Tikhonov!
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
+ <dependency>
+ <groupId>org.slf4j</groupId>
+ <artifactId>slf4j-log4j12</artifactId>
+ <scope>test</scope>
+ </dependency>
</dependencies>
<build>
