Openupgradelib

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* [IMP] Lift constraints
* [IMP] Update module field in ir_model_fields when calling rename_models
* [ADD] allow to create an environment automatically
* [ADD] rename references to the model in mail related records
* [ADD] rename_property
* [IMP] clarifying docstring
* [FIX] doc typo
* [FIX] .travis.yml: remove Python 2.6 test
* [RFR] Move column_exists so it can be used during loading
* [MIG] 10.0 imports

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* [FIX] missing %% in convert_field_to_html()
* [FIX] Remove wrong docs
* [FIX] Avoid broken updates
* [IMP] Add new context manager allow_pgcodes
* [FIX] support OpenERP version that don't have cr.savepoint

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* [IMP] New function 'is_module_installed()'
* [ADD] when renaming a model, also move link in ir_attachment
* [FIX] Compatibility for OpenERP versions prior to 6.1
* [FIX] use correct column name in rename_models
* [IMP] .travis.yml: Add auto-deployment
* [IMP] map_values: Support set & notset selectors

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* [IMP] set_defaults: Don't use ORM by default.
* Remove pip imports which break coverage with pypy3
* Add basic coverage configuration
* Factor out duplicated metadata about package
* [IMP] Google or NymPy docstrings
* [IMP] docstrings `copy_columns`, `rename_columns`
* [IMP] update_module_names: Handle ir_translation
* [FIX] lib for working with old API (<= 7.0)
* [FIX] set_defaults: Cope with inherited fields by delegation

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* Rerelease to pypi with proper upload
* Include requirements.txt
* Mark as Beta

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* Rewrite history with git filter-branch
* Remove unneeded files from history
* openupgrade_loading.py
* deferred80.py
* openupgrade_log.py
* openupgrade_loading.py