fixed localization of bootstrap's checkboxselectmultiple and radioselect
input values
added test case to confirm l10n is working
Fixing form_show_labels helper attribute to work with all layout objects
Added warning in docs for HTML layout object usage

Fixes #208
Pointing README Travis-ci buils status to master branch
Test for form_show_labels should only check for bootstrap template pack
Django widget attrs not applied to RadioSelect and CheckboxSelectMultiple

Fixes #206
Merge branch 'master' of github.com:gabejackson/django-crispy-forms into dev

Conflicts:
	crispy_forms/templates/bootstrap/layout/checkboxselectmultiple.html
	crispy_forms/templates/bootstrap/layout/radioselect.html
RadioSelect and CheckboxSelectMultiple texts should be unlocalized

Test cleanup, CHANGELOG and CONTRIBUTORS for #214
allow to override CRISPY_TEMPLATE_PACK in FormHelper