Fixed python2.6 compatibilit with sys.version_info tuple.
Add some clarification on the README about hstore extension.
HStoreDictionary is now pickable.
Merge pull request #8 from nferrari/pickle

HStoreDictionary is now pickable.
Add proposed testcase. All works ok.
Add other test running with two databases.
Now remove python3 incompatibilities.
Update documentation about python3 compatibility.
add test for None values
skip None values in get_prep_value()
Merge pull request #15 from fdemmer/nonevalues

Support NULL values
Add failing test for #11
Respect Django DeserializedObject
Fix deserialization issue
Make test fail again
Serialize DictionaryField using JSON
Fix python3 compatibility introduced in last commits.
Merge branch 'boronine-master'
add tests for ModelForm with DictionaryField
use initial in form field instead of model field