Build 170305 (preivew)

• Microsoft/BashOnWindows#1668: Fix wrong ANSI processing from Vim started in tmux.
• conemu#1055: Fix ‘Delete word lefward to the cursor’ at the bottom of the screen.
• conemu#787: Keyboard shortcut to scroll by prompts. Ctrl+Alt+PgUp/PgDn will jump between commands entered in the shell prompt. Take into account that prompt must pass to ConEmu the code ESC]9;12ESC\ (ConEmu default) or ESC[?7711h (mintty implementation).