support mercurial(experimental)
Fix starting 'hg diff' process
Remove needless 'with-temp-buffer'
Refactoring for supporting new vcs in the future
Update document
Fix for linum

- Fix no lines case
- Fix no update gutter case(case updating only linum)
Merge pull request #59 from syohex/fix-for-linum

Fix for linum
Bump up version and update Changes
fix conflict merge
Fix for git-gutter-fringe with linum-mode

I don't understand why 'ad-disable-advice' does not work,
so I use special global variable.
Bump up version and update Changes
Merge pull request #58 from syohex/support-mercurial

[WIP] support mercurial(experimental)
Bump up version and update Changes
Check whether 'hg' is installed(#60)
update message
Check also whether 'git' is installed
Merge pull request #61 from syohex/check-hg-is-installed

Check hg is installed
Bump up version and update Changes
Merge remote-tracking branch 'refs/remotes/upstream/master'