Fix catalogue search bug where user and orgazation names were turned to lowercase before searching index

Signed-off-by: Álvaro Arranz <aarranz@conwet.com>
Initial python 3 support
Add a ServiceEntry endpoint and its corresponding javascript API
Auto install offerings just when they are bought
Rename FiWareCatalogueResource to Offering
Rename FiWareCatalogue to Marketplace
Rename FiWare.ResourceDetailsView to FiWare.OfferingDetailsView
Remove unused template
Update NGSI.js fixing important bug afecting subscriptions
Use BytesIO in the proxy processors as data from request is treated as binary data
Use BytesIO instead of StringIO as the response content must be treated as binary
Remove hard code tenantId use in getAuthToken
Fix error reporting by the Object Storage API
More progress supporting python 3