finally cracked the load issues
use relative imports

with thanks to Sorin (http://stackoverflow.com/a/6098238/320438)
pythonise gitignore; better name for sdk demo script
modular app layout, "behave" for features, unit tests
switch to flask-testing & nose runner; colour!!
remove "behave" features in favour of flask-testing LiveServerTestCase
more semantic requirements
more passing tests
working!!
needs further tidying; testing on heroku
update git module path for heroku access
add runtime.txt for heroku
switch to gunicorn
remove reference to previous name
refactor to remove all references to previous name
deciding which is better
nasty changes
switch to tidied sdk
structure simplification
revert loading experiment