Update README.md
Add comments in pom.xml
Clickstart cleanup
* remove usage of `context.xml` to declare the datasource as the Tomcat7 clickstack now injects a JNDI datasource
* rename database binding to "`mydb`"
Enhance docs
Merge branch 'master' of https://github.com/cyrille-leclerc/tomcat7-maven-clickstart

Conflicts:
	README.md