<plugins>
        <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>exec-maven-plugin</artifactId>
           <version>1.5.0</version>
           <executions>
             <execution>
             <phase>generate-sources</phase>
             <goals>
              <goal>exec</goal>
             </goals>
             </execution>
           </executions>
           <configuration>
             <executable>bower</executable>
             <arguments>
              <argument>install</argument>
             </arguments>
             <workingDirectory>/</workingDirectory>
            </configuration>
        </plugin>