Merge branch 'mnt/no-past-releases' into 'master'

Mnt/no past releases

See merge request fsl/conda/manifest-rules!24

manifest_rules/__init__.py

 #!/usr/bin/env python
 
 
-__version__ = '0.4.7'
+__version__ = '0.4.8'

manifest_rules/generate_manifest_file.py

@@ -222,6 +222,13 @@ def main():
     # for development releases
     add_current_release = (version is not None) or (not official)
 
+    # The "official" variable controls whether the
+    # manifest should include info about past releases
+    # (which is done by downloading the current official
+    # release manifest). This can be overridden by
+    # setting the NO_PAST_RELEASES variable.
+    official = official and ('NO_PAST_RELEASES' not in os.environ)
+
     # Generate dev version identnfier
     if version is None:
         version = generate_development_version_identifier()