resolves #5 - Configured to enable 'apache-tiles' and created a simple template of web page.

 I want to resolve #5 in this commit that apache-tiles can be used.

 Configured to be able to use apache-tiles. It would be possible to create and use web page templates.
 A few JSPs were added to build a simple template that has header and footer, and main.jsp was changed to use the template.

 The way to see welcome page is quite same.

 At the end, 'commons-logging' was excluded from 'spring-framework', and 'jcl-over-slf4j' was added to dependencies, to mediate between 'commons-logging' and 'slf4j'.