Remove bancha CMS template.

The templare hasn't been touched since it was added and the project itself
hasn't been updated much since then either:

  http://docs.getbancha.com/basic/changelog.html
  https://github.com/squallstar/bancha/commits/master

Bancha.gitignore

-#Logs
-application/logs/*.php
-
-# Content types
-/application/xml/types/*.xml
-
-# Custom builds and generated php files
-/core/documentation/build
-/core/views/admin/content/translations.php
-
-# Attachs and cache files #
-*.tmp
-/attach/cache/
-/attach/
-/application/cache/_bancha/*.css
-/application/cache/_bancha/*.js