Include slf4j-jdk14 in heritrix-engine as a compile dependency

This eliminates the slf4j warning message on startup and should fix
logging for dependencies (such as crawlercommons) that use it.

engine/pom.xml

@@ -86,13 +86,11 @@
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-api</artifactId>
 			<version>${slf4j.version}</version>
-			<scope>test</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-jdk14</artifactId>
 			<version>${slf4j.version}</version>
-			<scope>test</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.freemarker</groupId>