Change the behavior of counted operations (#26)

Unlike the default search, Oblique

1. does not move cursor on star-search
2. and includes match starting from the cursor position

it makes sense to move one-less step when count is given.
Adjust count-steps if cursor is on the first match

/cc @nkouevda

https://github.com/junegunn/vim-oblique/pull/26#issuecomment-59793681
Need to unset hlsearch after normal! n
Do not unset hlsearch during search
Adjust s:count for star-search

Similar to the logic in s:search, but the default here is to not move
the cursor at all. 1* and 1# move to the first match, unless the cursor
is already on a match.
Merge pull request #31 from nkouevda/star-count

Adjust s:count for star-search