Merge pull request #220 from cocoonventures/readme_update

simply added 'gem install sprinkle' to documentation, obvious, but shouldn't be missing

Merge pull request #217 from weakish/gem-doc

gem: typo.

Merge pull request #212 from weakish/file-sha1

Revert accidental changes to `file_contains`.

Fix missing `build_doc` attribute declaration

Update options doc on gem installers.

Add `sha1_of_file` verifier.

bump version 0.7.7

allow verifiers access to deployment use_sudo flag

fix capistrano :use_sudo setting

fix specs from previous patch

fix selection of multiple package choices

Merge pull request #187 from JonRowe/sudo_binary_install_when_required