Add tomcat7-maven-plugin to pom.xml (See #141)

Add tomcat7-maven-plugin to pom.xml (See #141)

This is the setup to assist with deploying BSIS to a local Tomcat server. This is not suggested for production instances.

tomcat7-maven-plugin added to pom.xml:

![image](https://f.cloud.github.com/assets/1052668/2130942/7605d6c4-9299-11e3-802d-7904eab6427b.png)


Used instructions from http://tomcat.apache.org/maven-plugin-2.0/tomcat7-maven-plugin/usage.html
and http://www.mkyong.com/maven/how-to-deploy-maven-based-war-file-to-tomcat/ (uses a different plugin, but demonstrates setup of tomcat-users.xml and maven settings.xml)

- Add tomcat user to %TOMCAT_PATH%/conf/tomcat-users.xml:
\<tomcat-users\>
  \<role rolename="manager-gui"/\>
  \<user username="tomcat" password="tomcat" roles="manager-gui"/\>
\</tomcat-users>

- Add Tomcat server and authentication details to Maven %MAVEN_PATH%/conf/settings.xml:
\<settings\>
//...
\<servers\>
  \<server\>
	\<id\>tomcat\</id\>
	\<username\>tomcat\</username\>
	\<password\>tomcat\</password\>
  \</server\>
\<servers\>
//...
\</settings\>

- The username and password in settings.xml should match those used in tomcat-users.xml
- The \<server\> \<id\> used in settings.xml should match the server name used for \<server\> in pom.xml.

To make use of the plugin, the following can be used:
- mvn tomcat7:deploy
- mvn tomcat7:redeploy
- or use along with 'clean install':
  - mvn clean install tomcat7:deploy