Add default recipe which installs and starts consul as a service

[kevinreedy]

Changes in a nutshell:

• The default recipe now installs consul, specifying binary vs source based on an attribute (default is binary).
• The default recipe now includes the service recipe, which creates and starts a consul service. The service can be configured as bootstrap (single host and default), server, or client.
• There is now a servers attribute which is an array of servers to connect to on startup. This will allow a wrapper cookbook or role to configure a cluster of consul servers easily. Note that we don't want consul to restart when this list changes, so the init script template does not trigger a restart. We could probably make this smarter by writing a list of hosts to another file which doesn't trigger restart and having the init script read from it. I'm not aware of a good way to test this with test-kitchen.

Other notes:

• This PR also reincludes Update README.md #3, which seems to have gotten rebased out by accident. Let me know if I should remove it.
• Both before and after this PR, tests aren't being run against the binary or source suites, as the tests are defined only for the default suite.

kitchen verify before PR:

Instance            Driver   Provisioner  Last Action
binary-ubuntu-1204  Vagrant  ChefZero     Verified
binary-ubuntu-1404  Vagrant  ChefZero     Verified
binary-centos-65    Vagrant  ChefZero     Verified
binary-centos-510   Vagrant  ChefZero     Verified
source-ubuntu-1204  Vagrant  ChefZero     Created
source-ubuntu-1404  Vagrant  ChefZero     Created
source-centos-65    Vagrant  ChefZero     Verified
source-centos-510   Vagrant  ChefZero     Verified

kitchen verify after PR:

Instance             Driver   Provisioner  Last Action
default-ubuntu-1204  Vagrant  ChefZero     Verified
default-ubuntu-1404  Vagrant  ChefZero     Verified
default-centos-65    Vagrant  ChefZero     Verified
default-centos-510   Vagrant  ChefZero     Verified
binary-ubuntu-1204   Vagrant  ChefZero     Verified
binary-ubuntu-1404   Vagrant  ChefZero     Verified
binary-centos-65     Vagrant  ChefZero     Verified
binary-centos-510    Vagrant  ChefZero     Verified
source-ubuntu-1204   Vagrant  ChefZero     Created
source-ubuntu-1404   Vagrant  ChefZero     Created
source-centos-65     Vagrant  ChefZero     Verified
source-centos-510    Vagrant  ChefZero     Verified

[lock]

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