Maven: javax.servlet specification deployed

Based from your pom.xml, the only dependency that might have dependency on geronimo servlet is

 <dependency>
        <groupId>org.obliquid.helpers</groupId>
        <artifactId>obliquid-helpers</artifactId>
        <version>0.9-SNAPSHOT</version>
        <scope>compile</scope>
    </dependency>

Can you try excluding the geronimo in this dependency?

  <dependency>
            <groupId>org.obliquid.helpers</groupId>
            <artifactId>obliquid-helpers</artifactId>
            <version>0.9-SNAPSHOT</version>
            <scope>compile</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.geronimo.specs</groupId>
                    <artifactId>geronimo-servlet_3.0_spec</artifactId>
                 </exclusion>
             </exclusions>
        </dependency>

Clearly, something has a dependency on that JAR file. If it is not showing up in the dependency tree, perhaps it is due to a dependency of your webapp WAR file on another WAR file that has this dependency.

If that is the case, then you could get add an <excludes> to the <overlay> element of the build descriptor for the WAR file plugin; e.g.

...
<build>
  <finalName>webapp</finalName>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.1</version>
        <configuration>
          <overlays>
            <overlay>
              <groupId>xxx</groupId>
              <artifactId>yyy</artifactId>
              <excludes>
                <exclude>WEB-INF/lib/whatever.jar</exclude>
              </excludes>
            </overlay>
          </overlays>
        </configuration>
      </plugin>
    </plugins>
  </build>
  ...