removed old breadcrumb stuff
autodoc config

 * group members "groupwise": by type (methods, attributes)
 * set default flags to 'members', 'undoc-members' to avoid typing it everywhere
doc build: added intersphinx support + custom extension to support intersphinx with flask extensions
moved babel extension in new abilian.i18n module.

We are using a custom subclass of flask.ext.babel.Babel, so it makes sense to
move all code in its own dedicated module.

Plus, this module provides '_', '_l' '_n' symbols for convenient import without
always aliasing.
code formatting
enhanced doc presentation for abilian.i18n
added html comments for marking begin/end of boxes: makes easier understanding of generated page
removed old abilian.web.views module, will be replace by view module with class based view utilities
docs/exts is now an importable module
form macros: reviewed m_field, added m_form; ability to generate standard or "horizontal" forms
fix documentation format
added abilian.web.view: base view class, object view: view, edit, create, delete