Add resize option (move supported, resize not yet)
Fix dirty pixels bug

When drawing a rectangle and fooling with the cursor around the
original clicked point, dirty pixels were left and could appear in
the resulting screenshot + they were left when scrot exited.

I think this was because the XOR rectangle had trouble with a 1 px
height/width. Ensuring a rectangle is only drawn/erased when it's at
least larger than a 5x5 px square seems to fix the bug.
1 px is enough to make sure no dirty pixels are left
Resize rectangle selection feature

It is now possible to resize the rectangle selection when the cursor
is hovering a 10 px square external to the current selection in the
corners.
Allow moving the rectangle selection with arrow keys

ChangeLog and docs updated accordingly.
Format switch indentation
Allow Return to be pressed anytime a rectangle is drawn
When moving with arrow keys, reset hover/cursor
ChangeLog indentation (tab -> spaces)
Email -r bugs/features to me
Move selection to screen borders when < 10 px is left
Make resize handles *inside* the corners
\#define parameters for magic numbers
Merge branch 'master' of https://github.com/eepp/scrot into exp