made setup.py executable
auto-create "webassets.cache" directory if not booly
made true/false tests check for any pyramid "asbool" compatible booly values
added "webassets.cache" as path documentation
added unittest for "webassets.cache" as directory
Merge branch 'master' of https://github.com/sontek/pyramid_webassets
bumped version
added automagic boolean and JSON config conversion
added auto-bool and auto-json docs
merged sontek:master
Merge pull request #29 from metagriffin/master

enable "webassets.cache" to override and auto-create default path to cache directory