Allow object as a param and call toString

[blundell]

https://github.com/agentgt/jatl/blob/master/src/main/java/com/googlecode/jatl/MarkupBuilder.java#L338

this current signature is public final T text(String text) {

would be nice if it was public final T text(Object text) {

and called toString internally so I can call it like:

text(message) instead of text(message.toString())

[agentgt]

I suppose for pre Java 8 version of JATL this would probably be ok and even desirable given that text will take a null with out throwing a NPE. I somewhat prefer having conversion explicit but I can see how one would like the convenience of not having to do .text(o != null ? o.toString() : null).

However the next major version / rewrite I think will probably not allow nulls but rather String, Optional<String>, Supplier<String> and the combined Optional<Supplier<String>>. Hopefully I have shown how a blind Object.toString would not be good for Java 8.

Feel free to add more feature requests as I would rather not crank out a release for something so small like this.