Add SLF4J support in Maven project

maven_slf4j.xml

<!-- Properties -->
<slf4jVersion>1.6.1</slf4jVersion>

<!-- Dependencies -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>${slf4jVersion}</version>
</dependency>

<!-- Binding for NOP, silently discarding all logging. -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-nop</artifactId>
    <version>${slf4jVersion}</version>
</dependency>
<!-- Binding for System.out -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>${slf4jVersion}</version>
</dependency>
<!--Binding for log4j version 1.2.x You also need to place log4j.jar on your class path. -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>${slf4jVersion}</version>
</dependency>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.16</version>
    <scope>runtime</scope>
</dependency>
<!--Binding for commons logging over slf4j -->
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jcl-over-slf4j</artifactId>
    <version>${slf4jVersion}</version>
    <scope>runtime</scope>
</dependency>