Update README.
Fix instructions in the README.
Remove quotes from commit message in git-push.
Add Git deployer.

This will replace the git-push command.
I haven't used a deployer before because
I couldn't make it visible to nanoc.
The reason is pretty simple: an :identifier
attribute had to be set.

See also: https://github.com/nanoc/nanoc/issues/256
Merge branch 'master' into sample-pages
Update README.
Remove the git-push command.

This has been replaced by git-deployer.
Merge branch 'master' into sample-pages