Fix test/smoke_test.vim
'Smoke:異常系' test case to consider Vim's :language setting.
Fix auto-source mechanism. It's to work any working directory.
The before implementation, auto-source mechanism cannot find product
code depending on working directory.
Because the test script's *relative* path may not contain "/test/".
Changed "VimTestFailure" highlight, link to Error.

I think, you should delegate the colors of syntax highlight to the default
highlighting groups. Because, if you don't, these colors may conflict to
the colorscheme that user select.

But, I have no idea that you should use syntax group for the "Success" test
result...
Merge pull request #6 from AmaiSaeta/fix/smoke_test-abnormaltest/test-failed-be-do-to-not-en-lang

Fix "Smoke:異常系" test case.
Merge pull request #7 from AmaiSaeta/fix/auto-source/work-anywhere

Fix auto-source mechanism. It's to work any working directory.
Merge pull request #8 from AmaiSaeta/fix/error-highlight

 Changed "VimTestFailure" highlight, link to Error.
fix test