views_board 1.0.0-beta2

A way for a site to decide who moves a card, and two fixes for moves the site refuses.

• A site can let people move cards they may not edit, or stop people who may, with the new BoardMoveAccessEvent. See "Who may move a card" in the README (#5).
• A move refused by validation, on an item that has another invalid field, answered 500 instead of 422 with the reason (#3).
• The confirmation of a move shows at the bottom of the window, so it is in view on a board taller than the window. A site that keeps a bar at the bottom of the window raises it with --views-board-toast-offset (#4).