[issue-347] Improve DELETE query
Use prepared statement
[issue-347[ Align code
[issue-347] Remove empty line
[issue-364] Remove dollar from variable name
[issue-364] Filter roles
[issue-364] Align data object
[issue-364] Bring back Ajax action name
[issue-364] Separate vars
Merge pull request #365 from x-team/issue-347

Issue 347: "Reset Stream Database" doesn't clear everything
Merge pull request #366 from x-team/issue-364

Issue 364: Autocomplete not working correctly in Exclude Authors & Roles field
Merge branch 'develop' of https://github.com/x-team/wp-stream