For some reason your warSourceDirectory isn't set correctly.
Try to right-click the project and call Maven>Update Project Configuration.
If this doesn't help, probably there is a bug in the m2eclipse-wtp integration.
A workaround is to replace
<wb-resource deploy-path="/" source-path="/smsurbano-1.0-SNAPSHOT"/>
with
<wb-resource deploy-path="/" source-path="/src/main/webapp"/>
in the .settings/org.eclipse.wst.common.component.
BTW, since you are using Java EE 6 and JDK 6, you have to set the compiler target and source to 1.6.
...
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
...