adding a text file in case some people are confused about not finding Spring config files inside WEB-INF

- integrated Gordon's comments in the POM
- removed antlr from the POM that we don't need anymore
- changed webjars versions inside headTag.jsp

Build and logging improvements

- migrated to Spring 3.2.1
- added hamcrest to the POM so it can be used with the Spring MVC Test
Framework
- Started migrating a JUnit test to Spring MVC Test Framework (at this
stage, it stills doesn't work. It could be because of a conflict with
ContentNegotiatingViewResolver)

Changed the birth date for all the pets (so we do not have a 12 year
old hamster where their life expectancy is 2-3 years :)  )

Polish