cannot install/update plugins

[MasahiroSakoda]

currently vimppm cannot install/update at all because of following issue..

• wrong URL like raw.github.com should be like raw.githubusercontent.com
  • so, directory created, but doesn't install
• error log could not be found

@cd01 through there is no statement for contribution,
is there rule or required thing for pull request?

[cd01]

Thanks for reporting!
At least fixed code, I will check and merge it.

[cd01]

Fix at dev branch

• s/raw.github.com/raw.githubusercontent.com/g
  8410ca4