add django 1.3.7 env for travis
Merge pull request #31 from saippuakauppias/restore_django_1_3_support

add django 1.3.7 env for travis
Do not run coveralls if build fails
Added Django 1.6b1 support
Properly disable output of ipgeobase command
Make master support experimental back
Updated contribution docs

Fixes #33
is_base field in City model added
country name in City
migrations