Update vital-over

- Add <S-Left> & <C-Left>
- Fix <cword> expansion with InsertRegister
spec: add failing test cases with InsertRegister
Fix c_<C-r><C-w> with incsearch
spec: fix test case
spec: fix & improve test cases
spec: fix test
spec: fix-travis?
spec: fix spec
spec: fix history
spec: use `noremap n n` instead of `unmap n`
spec: workaround :unmap
spec: add failing test case for vim under 7.4.421
Fix crash when searching for "\ze*"

fix #28
spec: improve E888 spec
Add E68 error to ignore error list