Include basic ability to run OCUnit tests

The addition of the XCodeTestMojo and the xcodeProjectName property allows including elements like the following in executions
```
<execution>
    <id>libZMap-testWithReport</id>
    <phase>test</phase>
    <goals>
       <goal>test</goal>
    </goals>
    <configuration>
        <target>libZMapTests</target>
        <xcodeProjectName>libZMap</xcodeProjectName>
        <xcodeCompileDirectory>libs/libZillow/libZMap</xcodeCompileDirectory>
        <buildActions>
            <buildAction>build</buildAction>
        </buildActions>
        <configurations>
             <configuration>Debug</configuration>
        </configurations>
        <sdks>
             <sdk>iphonesimulator</sdk>
        </sdks>
     </configuration>
 </execution>
```