add ability to exclude sample values for
some fields in mass_update ( is TextField)
updates django version in Makefile and travis config
Merge branch 'develop' of github.com:saxix/django-adminactions into develop

* 'develop' of github.com:saxix/django-adminactions:
  Fix the usage of "Customize Massupdate Form"
removes unuse module py_settings
fixes Makefiledb creattion
mysql TEST_COLLATION