ADD: optional maven dist path

Allow optional destiny for the mavenDist. When integrating with eclipse https://github.com/SebastianCerquera/grunt-maven-plugin-sandbox and using wtp(Web Tools Platform) , it's not possible to use the same directory 

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.4</version>
				<configuration>

					<!--
					
					If wtp integration is requiered, warSourceExcludes does not work
					because eclipse still deploying webapp/static, then without your bower
					dependencies.  
					  
					<webResources>
						<resource>
							<directory>target-grunt</directory>
							<includes>
								<include>dist/**</include>
							</includes>
						</resource>
					</webResources>
					
					The exploded war still containing webapp/static
					<packagingExcludes>static/**</packagingExcludes>
					
					-->

					<warSourceExcludes>static/**</warSourceExcludes>
				</configuration>
			</plugin>