Fixes my issue for #67

Addressing https://github.com/dyve/django-bootstrap3/issues/67 as django.forms.widgets.ClearableFileInput wasn't explicitly covered by the is_widget_required_attribute function.
upgrade .gitignore
refactoring setup.py
added skeleton for creating documentation to fix issue #30
incremented version number
refactoring docs
added sphinx docstring to functions
Merge pull request #68 from bradbeattie/master

Fixes my issue for #67
Version bump, file field issues fixed (thanks)
Merge pull request #69 from luzfcb/add-docs

added initial documentation, and settings to fix issue #30
Working Sphinx documentation, thanks to @luzfcb
Merge remote-tracking branch 'upstream/master'

Conflicts:
	bootstrap3/forms.py