Added new method to Page model

Check if a Fiber page has visbile children (show_in_menu field must be True). Very useful for templating Fiber page menus.
Merge pull request #151 from nvandijk/dev

Added new method to Page model
Fixed a bug for removing files for Image and File model. Use storage delete mehtod instead of python os file remove. Now it's also working with different file storages backends.
Updated Django Fiber requirements

Pillow to 1.7.8
Django MPTT to 0.5.5
Django compressor to 1.2
Django restframework to 2.1.17
Updated readme
Merge branch 'dev'
Bumped version to 0.10.1
Upgrade to CKEDITOR 4.0.1.
Drop redundant static files.