Inverted Sections For Empty List

Test for inverted sections with lists

Only returning functions when they are unbounded methods otherwise they get called in the return and fail.

add support for nested contexts as described in the "Non-False Values" section of http://mustache.github.com/mustache.5.html

and use them setup's long_description argument.

View.load_template start looking for the template
in first path of the list.