Template.Execute returns []byte about pongo2

[flosch]

I could think of a separate method (like ExecuteWriter()) where you can provide your own Writer which would not lead to string-shifts anymore. I'll keep that in mind and may come up with a solution for that. There are no plans yet to modify Execute() or ExecuteRW() though.

[unknwon]

Yes, I didn't mean to change original methods, but provides ExecuteWriter() sounds good!

[flosch]

I worked on that today. I removed the ExecuteRW(), instead now pongo2 provides a more general ExecuteWriter(). My commit a1fab22 reduces overall pongo2 memory footprint and allocation count as well.

[flosch]

I added a ExecuteBytes()-function as well which returns []byte.