Add matchVisual configuration to Clipboard.

• Use DOM API to determine selected <select> option #1576
• Add :focus styles to toolbbar #1540
• Allow users to undo automatic keyboard completions #1538
• Use github-pages gem to make development environment consistent #1536 #1544
• Fix composing Chinese with preformatting #1514
• Fix example clipboard module in docs #1502
• Fix list layout in RTL mode #1498
• Clarify documentation for scrollingContainer #1496
• Add tel to default link whitelist #1436
• Fix cursor interaction with custom contenteditable=false embeds #1172 #1181
• Fix rendered cursor in Chrome when interacting with scrollbar #1114

Thanks to @alexkrolick, @amitm02, @Christilut, @danielschwartz, @emanuelbsilva, @ersommer, @fiurrr, @jackmu95, @jmzhang, @mdpye, @ralrom, @sferoze, @simon-at-fugu, and @yogadzx for contributions to this release!