pages (blog): new `edit` page: this page is used for new blog post and may be used for editing existing posts too. New `editor` module is using for autosave and tags editor. New `mbPreview` bridge method is used to generate preview when javascript is available.

import os.path

version_file = os.path.join(os.path.dirname(__file__), "VERSION")
try:
    with open(version_file) as f:
        __version__ = f.read().strip()
except NotImplementedError:
    # pyjamas workaround
    __version__ = "0.7.0D"