Merge pull request #11 from JensTimmerman/master

Update setup.py
setup.py fix: read long description from file
Updated changelog
fix #2

Remove incorrect instructions in help_text for ManyToMany fields
Merge pull request #13 from bashu/master

Fix #2 - incorrect instuctions in help_text for ManyToMany fields
Version 1.2.8
Split python/js code

Changes is taken and adopted from *bashu`s* fork that gives an
example how to fix issue#12.
Transform select2 options to correct json
Removed inline_script from Select2TextMixin
Updated documentation
Version 1.2.9