Tests and improvements on management of request params containing dots,
related to issue #188. Fixes #217

Also provide a alternative configuration to mvc:annotation-driven
automagic to offer users a simpler way to override default behaviour on
dots and extensions management without redefining all mvc beans - and
particularily Exception management (see added test cases).
set explicitly jpa provider in order to remove warning (cf. https://hibernate.atlassian.net/browse/HHH-8625). fixes #218