Add lispy-show-top-level

[aspiers]

Add a new command lispy-show-top-level which shows the first line of the top-level form containing the point in the echo area. This is useful for seeing which top-level form the point is in when the form is long enough that its beginning has scrolled off the top of the screen. The user might not always know which form they're in, e.g. if they jumped into the middle of a long form via a search or some other code navigation technique.

Bind to C-5 outside special mode, and to xS inside special mode. These are just suggested bindings, and can of course be changed if anyone has better ideas.

[coveralls]

Coverage decreased (-0.05%) to 62.86% when pulling 3f01261c2695e2a9841452989bc1b8b44a485f6c on aspiers:show-top-level into 5c8a59ae7dd3dd342e7c86a8c0acdbd13e2989f3 on abo-abo:master.

[abo-abo]

Thanks, merged with minor revisions:

• the built-in beginning-of-defun can be used
• the binding "xw" (as in "where") can be used to avoid using Shift
• let's keep the C-5 binding free for potential new commands

[aspiers]

Cool thanks, they all sound like great improvements!