update to use cuma instead of clostache. but clostache can be used with old setting.
fix config default values
#36 atom base url definition move to _config.clj
update test code to use cuma, and add clostache pattern test
add misaki.util.string/render tests
update readme
update misaki.compiler.default.core/compile* to use  function
update dependencies
add tests for _config usign clostache template
update documents to use cuma instead of clostache