add ValidationDemo based on JSR 303 (Hibernate Validator)
Fix Response.setContentType() which did not set the content type!
Support message and date/time localization within Freemarker and Jade templates

Add template engine helpers for accessing localized messages (e.g. i18n("key.name")),
helpers for formatting localized relative dates (e.g. prettyTime(aDate)), and helpers
for formatting localized date/times (e.g. formatTime(aDate, "full")).

To showcase these improvements a new Freemarker demo app has been created and the Jade
demo app has ben rewritten to be a Jade-variant of the Freemarker demo.
Add Trimou template engine with full i18n, prettyTime, and formatTime support
Add Pebble template engine with full i18n, prettyTime, and formatTime support
Add Groovy template engine with full i18n, prettyTime, and formatTime support
Address review comments for #24
Fix inconsistency in Jade helper between documentation, implementation, and other engines
Merge pull request #24 from decebals/template_engines

Support message and date/time localization within Freemarker and Jade templates
use PippoRuntimeException with varargs (similar with Logger from slf4j)
Fix regression in generating urls from a pattern and a parameter map
If a response is not committed after executing the handler chain, send a 404
Allow specification of the application context path in application.properties
Merge pull request #26 from decebals/context

Allow specification of the application context path in application.propeties
Fix urlFor with regex paths and add unit tests to protect against regressions
Merge pull request #27 from decebals/routematcher

Fix urlFor with regex paths and add unit tests to protect against regressions
split artifacts in categories (in readme)
remove template file extension (in readme)
update list with demo applications (in readme)
minor change