Reduce terminal escape key delay

Vim by default waits for one second after reading the <Esc> key to read
the following escape sequence.  I don't type escape sequences by hand,
so this sets it to 10 ms.  That's plenty of time for any terminal that
can run Vim.  (Setting it to 0 ms can cause garbage characters when
using the arrow keys.)
Minor reorganization
Always start at first line of git commit messages