Specialised template loaders have no knowledge of the extension commonly associated with their engine

[lenormf]

Hi,

When using for example @mako_view("index"), the template engine will not pick up index.mako.

This happens because the BaseTemplate class has a hardcoded list of extensions that its specialisations don't modify accordingly to the extension that is commonly associated with them.

I'm currently working around that issue with the following:

bottle.BaseTemplate.extensions.append("mako")

I think a better way would be for the MakoTemplate, CheetahTemplate and Jinja2Template to pass to their parent class an additional extension upon instantiation. Consequently, the stpl extension should not be kept as a default extension in BaseTemplate, but passed by the SimpleTemplate class.

I can do a PR if you want me to!

HTH.

[lenormf]

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