Add up-to versions

See `iy-go-up-to-char', `iy-go-up-to-char-backward',
`iy-go-up-to-char-continue' and `iy-go-up-to-char-continue-backward'.

Like go-to version counterpart, up-to version jump up to the char so the
char is not included in the region between search start position and
current point.
Merge branch 'jump-up-to-char'

Fixed #1