Updated pom.xml and main documentation artifacts to Spring4
Adapted all existing artifacts to thymeleaf-spring4 layout
[maven-release-plugin] prepare release thymeleaf-spring4-2.0.20
[maven-release-plugin] prepare for next development iteration
Fixed bad relative URLs in v3 of XHTML 1.0 Frameset DTD
Fixed relative URLs in XHTML Frameset DTD for older versions
Fixed version number in v3 DTDs
#6 Add MapAccessor to ThymeleafEvaluationContext
Merge pull request #7 from nithril/2.0-dev

#6 Add MapAccessor to ThymeleafEvaluationContext
Updated ChangeLog
Moved Spring 3.x code to specific 'thymeleaf-spring3' folder
Integrated thymeleaf-spring4 repository into thymeleaf-spring
Removed unneeded files
Modified README