Notification server updates

[localhuman]

update notification endpoint to include total_pages in output, and allow pagesize paramater to be passed in. This brings the server in parallel with the C# notification implementation.

Also now page index starts at 1 rather than 0. Passing in page=0 will convert to page 1.

How did you solve this problem?

• added total_pages value to output.

How did you make sure your solution works?

• tests

Please check the following, if applicable:

• Did you add any tests?
• Did you run make lint?
• Did you run make test?
• Are you making a PR to a feature branch or development rather than master?
• Did you add an entry to CHANGELOG.rst? (if not, please do)

[coveralls]

Coverage increased (+0.02%) to 80.346% when pulling 43ba575 on notification-fixes into 19a786b on development.