Reduce number of places version is defined

docs/conf.py

@@ -62,7 +62,8 @@ copyright = '2017, ' + author
 # built documents.
 #
 # The short X.Y version.
-version = '0.8.0.dev0'
+from pywwt import __version__ as version
+version = version
 # The full version, including alpha/beta/rc tags.
 release = version
 

lib/version.js

@@ -0,0 +1 @@
+export const version = require('../package.json').version;

lib/wwt.js

@@ -1,16 +1,18 @@
 var widgets = require('@jupyter-widgets/base');
 var _ = require("underscore");
 
+var version = require('./version').version;
+
 var WWTModel = widgets.DOMWidgetModel.extend({
     defaults: _.extend(widgets.DOMWidgetModel.prototype.defaults(), {
 
         _model_name : 'WWTModel',
         _model_module : 'pywwt',
-        _model_module_version : '0.8.0',
+        _model_module_version : version,
 
         _view_name : 'WWTView',
         _view_module : 'pywwt',
-        _view_module_version : '0.8.0',
+        _view_module_version : version,
 
         _ra : 0.0,
         _dec : 0.0,

pywwt/jupyter.py

@@ -11,11 +11,12 @@ from ipyevents import Event as DOMListener
 from .core import BaseWWTWidget
 from .layers import ImageLayer
 from .jupyter_server import serve_file
+from . import __version__
 
 __all__ = ['WWTJupyterWidget']
 
-VIEW_MODULE_VERSION = '0.8.0'  # synchronize these with lib/wwt.js
-MODEL_MODULE_VERSION = '0.8.0'
+VIEW_MODULE_VERSION = __version__
+MODEL_MODULE_VERSION = __version__
 
 dom_listener = DOMListener()