Add versioneer.py for managing BentoML version (#253)

* install versioneer

* don't auto format versioneer code

* use version managed by versioneer and VCS

* Update setup.cfg

* updates

* remove tag_prefix

* Fix tag_prefix

* move __version__ up

* auto format

* linter updates

.flake8

@@ -1,4 +1,4 @@
 [flake8]
-ignore = E203, E266, W503
+ignore = E203, E266, W503, E402
 max-line-length = 88
-exclude = proto
+exclude = proto, _version.py

.gitattributes

@@ -0,0 +1 @@
+bentoml/_version.py export-subst

.pep8speaks.yml

@@ -10,6 +10,7 @@ flake8:
       - W503
     exclude:
       - proto
+      - bentoml/_version.py
 
 only_mention_files_with_errors: True
 

MANIFEST.in

@@ -30,3 +30,5 @@ global-exclude *.pyo
 global-exclude .git
 global-exclude .ipynb_checkpoints
 global-exclude __pycache__
+include versioneer.py
+include bentoml/_version.py

bentoml/__init__.py

@@ -16,9 +16,12 @@
 from __future__ import division
 from __future__ import print_function
 
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions
+
 from bentoml import handlers
 from bentoml.config import config
-from bentoml.version import __version__
 
 from bentoml.service import (
     BentoService,