Adds auto configuration for the scalate template engine

[cnagel]

Hello Spring boot team,

I implemented an auto configuration for the scalate template engine to support more view formats making web development much easier.
Therefore I used the scalate-spring-mvc_2.10 maven module.
The commit contains the auto configuration class and some tests with resource files.

Regards,
Christoph.

[philwebb]

Thanks for the pull request. We are going to need to defer this for v1.1 since we are now getting so close to 1.0 GA. We want to consider various templating solutions and add several at the same time (see #371 for example).

If you want to offer support for Spring Boot 1.0 you could always extract this to a separate project, or possibly make it part of scalate-spring-mvc directly.

[philwebb]

I'm a little reluctant to add direct support for scalate for 1.2. I wonder if it might be worth making this auto-configuration part of the scalate-spring-mvc module itself? We've seen this approach work quite well for some other contributions.

Since META-INF/spring.factories files are picked up from all JARs you can easily ship auto-configuration along with the library. This would mean that anyone using scalate-spring-mvc.jar with Spring Boot would automatically get support.

[wilkinsona]

As suggested above by @philwebb, a third-party starter with its own auto-configuration is a better fit here.