Minor updates to improve performance and maintainability

.dockerignore

@@ -1,6 +1,6 @@
-.git/
 .settings/
 README.md
 *.swp
 .venv*/
-GeoConverter/settings_production.py
+*.tar
+*.sqlite

.gitattributes

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

GeoConverter/__init__.py

@@ -1,13 +1,8 @@
-import codecs
-import re
+from ._version import get_versions
+__version__ = get_versions()['version']
+__date__ = get_versions()['date']
 
-__version__ = '1.0.0'
-__date__ = 'May 12, 2016'
 
+def get_metadata():
+    return get_versions()
 
-def get_metadata(filepath=__file__):
-    with codecs.open(filepath, encoding='utf8') as version_file:
-        return dict(
-            re.findall(
-                r"""__([a-z]+)__\s*=\s*["']([^"']+)""",
-                version_file.read()))