Added configuration variable REQUESTS_MAX_RETRIES temporary

until #42 will be fixed definitely.
Updated Django versions for tox tests.
Implemented quiet ignoring a delete if the item has been deleted yet. Closed #14
Added more information into SalesforceError

without changing the length of message.
Restricted unimportant debug info again after the last commit.
Preparing for multi db
Improved router in order to be more robust and more exact with syncdb and dumpdata.
Verified that 'managed=False' is not so important after the previous fix
Typography: trailing whitespaces
Merge pull request #52 from hynekcer/bugfixes

Fixed #14, improved #2,
increased timeout length for unit tests
Restrict unimportant messages in test_double_delete.
Set the normal DNS resolution again if not restricted explicitely

to IPv6 by IPV4_ONLY setting. Fixes #53
Merge pull request #54 from hynekcer/bugfixes

Fixed #53: Patch IPV4_ONLY now used only explicitely
Removed an unimportant part of test that can not be silenced