Fix dynamic assignment of stream attributres @correctModelField

It needs to have "=" at the end of the attribute name if you want the "send" method to work
Fix bug deleting a stream
Remove legacy code and use of semantic constants
Load async script following web conventions
Remove legacy source file
Use a proper path @semantics_get
Implement error handling when Not Allowed Access
SAVEPOINT
SAVEPOINT
Fix access_token renewal.

The frontend now calls the "renew_token" method at api.rb, sending the new tokens generated by the library locally.
Then, both frontend and backend get updated.
Merge pull request #2 from EricssonResearch/fix-integration-issues

Fix integration issues