Upgrade builVersion.py

- rename build_version.py
- Adapt to the improved documentation structure (api, reference, user).
- Adapt to the branching model running with GitLab (master, production).
- Closes #3.

.gitignore

@@ -9,7 +9,6 @@ cache/
 cron/
 databases
 databases*/
-*build*
 *jsduck*
 *epydoc*
 *sphinx*
@@ -21,4 +20,5 @@ private/
 *plugin_mathjax*
 sessions/
 static/*-min.js
+static/docs/
 uploads/