Liquimigrate

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* added `management` to `MANIFEST.in`

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* handle liquibase return codes as an exception

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* add documentation and better package layout

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* fix for disabling signals
* add possiblity to disable emitting pre- and postmigrate signals
* add example project configured with liquibase migrations

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* more detailed messages in makemigrations and squashmigrations commands
* Django 1.7+ compatibility + wrapped migration commands

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* Update README.rst
* removed version from __init__
* Update README.rst
* back to previous versioning scheme
* cleaned up settings header
* Changed Makefile:pypi to not use iw.dist
* Update README.rst
* possibility to change liquibase jar and connectors via settings
* db name, host, port were overriden by defaults