First pass at an Add / Remove Topics feature.
Don't show two "Done" buttons.
Merge triage
Add titles to alert view cancel buttons.
Escape topic name before building URL path.
If topic already exists mark it as current.
Ensure checked row refreshes when topic changes.
Make sure editable rows are visible in landscape orientation.
Adding changes from feedback.

Disables user interaction on the page control
Sanitizes topic names before building the REST API endpoint
Scrolls the selected toipc into view when showing subscriptions.
Scrolls newly added toipcs into view.
Makes changes based on feedback.

Replaces tabs for spaces.
Reorders method definitions.
Makes argument name match what is specified in param.
Improves check for an empty topic name when sanitizing.
Change keyboard 'Search' button to a 'Done' button.
Merge pull request #1888 from wordpress-mobile/issues/1681-add-remove-topics

Add / Remove Topics feature for the Reader