User:CharlotteWebb/history filter

To-do

 * Add block button (and more?) if viewing user haz admin.
 * Add paging feature (for users with >500 edits to one page).
 * Make it default to 50 and properly respect the &limit=, &offset= url parameters.
 * Parse wiki-text of edit summaries.
 * Improve code readability, documentation
 * Profit!