Upgrade dependencies and fix benchmark setup

This commit:
* upgrades Spring Boot and Tomcat dependencies
* removes memory JVM args from setup.py
* fixes Tomcat and app configuration for the benchmark
Upgrade to Spring Boot 1.0.0.RC4
Fix and comment Tomcat configuration

* comment choices in Tomcat configuration
* disable access logs; performance boost...
Merge pull request #801 from bclozel/boot-upgrade

Upgrade Spring dependencies and fix setup