changes:
* removed version from setup.py
* asserts replaced by exceptions
* added logging to pypushwoosh.client
* CreateMessageCommand is splitted to CreateMessageForApplicationCommand, CreateMessageForApplicationGroupCommand

features:
* added DateTagFilter, DaysTagFilter, BooleanTagFilter, IntegerTagFilterByApplication, StringTagFilterByApplication, ListTagFilterByApplication, DateTagFilterByApplication, DaysTagFilterByApplication, BooleanTagFilterByApplication

bugfixes:
* fixed bug in FilteredNotificationMixin
* added missed wp_backcontent property to WindowsPhoneNotificationMixin
* added missed BlackBerryNotificationMixin
* fixed valid_operand_for_operator
* added documentation
* updated CHANGES.txt
Merge branch 'master' of https://github.com/Pushwoosh/pushwoosh-python-lib

Conflicts:
	setup.py
[artefact][PUSH-2329] Add tests
changes:
* removed version from setup.py
* asserts replaced by exceptions
* added logging to pypushwoosh.client
* CreateMessageCommand is splitted to CreateMessageForApplicationCommand, CreateMessageForApplicationGroupCommand

features:
* added DateTagFilter, DaysTagFilter, BooleanTagFilter, IntegerTagFilterByApplication, StringTagFilterByApplication, ListTagFilterByApplication, DateTagFilterByApplication, DaysTagFilterByApplication, BooleanTagFilterByApplication

bugfixes:
* fixed bug in FilteredNotificationMixin
* added missed wp_backcontent property to WindowsPhoneNotificationMixin
* added missed BlackBerryNotificationMixin
* fixed valid_operand_for_operator
fix imports bug. thanks Dewey.
fixed README.rst markup