Added Alert class and template to allow for Twitter Bootstrap Alert pane.
Fixing an issue where as_crispy_field would not render form labels due to the addition of the form_show_labels context variables in 1.3.0
- added bootstrap3 template pack
- updated bootstrap.py module to look at TEMPLATE_PACK instead of directly ref 'bootstrap'
- collapsed appended_text, prepended_text, and
appended_preprended_text into one class and template, the three were almost identical
- added input_size to prepend append handler
- corrected css classnames control-group > form-group, help-inline > help-block, alert-error > alert-danger
- added css class form-control to CrispyFormNode if bootstrap3
- updated crispy_addon tag to comply with the revamped prepend_append handling
- updated test assertions to cooperate with bootstrap 3
Merge branch 'bootstrap-alert' of github.com:alexhayes/django-crispy-forms into dev
Merge branch 'dev' of git://github.com/jamesmfriedman/django-crispy-forms into dev

Conflicts:
	crispy_forms/templates/bootstrap/layout/appended_text.html
	crispy_forms/templates/bootstrap/layout/prepended_text.html
Fix for checkboxes in bootstrap3

See issue #213
Adjusting field_with_buttons template for bootstrap3

Issue #213
Moving UneditableInput to bootstrap.py module

Adjusting its template for bootstrap3 #213
Cleaning up a little bit bootstrap coding style

Related to #213
Fixing pairwise for {% crispy_field %}

This was broken by PR #213
Adjusting tests