Fix for dotted dicts and pymongo 2.7

Provide fix for dotted dict and i18n dict. There was huge __getattr__ protocol violation in those classes thar caused problems with new versions of pymongo c extension
Restore Python 2.6 compatability
Another python 2.6 compatability fix
Copy-paste misstype
Merge branch 'fix-dotted-dict-upstream' into fix-dotted-dict

Conflicts:
	mongokit/helpers.py
	tests/test_i18n.py