Merge branch 'release/0.1.3' into develop
Add travis file
Merge branch 'hotfix/add_travis' into develop
Add vagrantfile + provisioning scripts
Fix #20: use markdown for authors file
Merge branch 'master' into develop
Add password flag registration as global option [ref #13]
Update password flag to fetch it's default value from env [ref #13]
Add constants for trousseau password env var name [ref #13]
Update decryption mecanism to use password from global option [ref #13]

This is basically a workaround the global password option system.
A huge refactoring should be made later on to get rid of the whole
environment struct thing.
Update README instructions for password option [fix #13]
Merge branch 'feature/use_password_option' into develop
Reword password occurences to passphrase
Fix go fmt
Fix #14: password can be retrieved via the system keyring manager
Add Readme instruction to use the keyring manager [ref #14]
Merge branch 'feature/keyring_managers_compatibility' into develop
Import gpgagent wrapper from camlistore [ref #18]
Fix #18: implement gpg agent support
Add gpg-agent usage instructions to the README [ref #18]