Add git-gutter-fr:line-to-pos

Ideally git-gutter-fringe would start working the same way git-gutter
has been changed to figure out the changes, but this at least makes it
work rather than calling a non-existing function.
Merge pull request #12 from tanzoniteblack/line-to-pos

Add git-gutter-fr:line-to-pos
Bump up version and update Changes

- update git-gutter version
make faces inherit from git-gutter

Rather than having identical definition in 2 places, just have
git-gutter-fr faces inherit from their git-gutter counterparts. This
will also allow theme designers to support both modes more easily
without breaking anyone's personal changes if they've defined the fringe
faces and not the git-gutter versions (or for some reason actually want
to have different values for the two different modes).
Merge pull request #13 from tanzoniteblack/inherit-faces

make faces inherit from git-gutter
Optimize view

- reduce save-excursion as possible
Merge pull request #14 from syohex/optimize

Optimize view
Bump up version and update Changes