upgrade dependencies
Add support for multiple mustache implementations

* reintegrated forked code from
* [mustache.java-spring-webmvc](https://github.com/ericdwhite/mustache.java-spring-webmvc/)
* updated i18n support for mustache.java and jmustache
[maven-release-plugin] prepare release mustache-spring-view-1.3
[maven-release-plugin] prepare for next development iteration
update README
Merge remote-tracking branch 'upstream/master'