Add volume API/CLI

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

man/docker-volume-create.1.md

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+% DOCKER(1) Docker User Manuals
+% Docker Community
+% JULY 2015
+# NAME
+docker-volume-create - Create a new volume
+
+# SYNOPSIS
+**docker volume create**
+[**-d**|**--driver**[=*local*]]
+[**--name**[=**]]
+[**-o**|**--opt**[=**]]
+
+[OPTIONS]
+
+# DESCRIPTION
+
+Creates a new volume that containers can consume and store data in. If a name is not specified, Docker generates a random name. You create a volume and then configure the container to use it, for example:
+
+  ```
+  $ docker volume create --name hello
+  hello
+  $ docker run -d -v hello:/world busybox ls /world
+  ```
+
+The mount is created inside the container's `/src` directory. Docker doesn't not support relative paths for mount points inside the container. 
+
+Multiple containers can use the same volume in the same time period. This is useful if two containers need access to shared data. For example, if one container writes and the other reads the data.
+
+## Driver specific options
+
+Some volume drivers may take options to customize the volume creation. Use the `-o` or `--opt` flags to pass driver options:
+
+  ```
+  $ docker volume create --driver fake --opt tardis=blue --opt timey=wimey
+  ```
+
+These options are passed directly to the volume driver. Options for
+different volume drivers may do different things (or nothing at all).
+
+*Note*: The built-in `local` volume driver does not currently accept any options.
+
+# OPTIONS
+**-d**, **--driver**=[]
+   Specify volume driver name
+**--name**=""
+  Specify volume name
+**-o**, **--opt**=map[]
+  Set driver specific options
+
+# HISTORY
+July 2015, created by Brian Goff <cpuguy83@gmail.com>

man/docker-volume-inspect.1.md

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+% DOCKER(1) Docker User Manuals
+% Docker Community
+% JULY 2015
+# NAME
+docker-volume-inspect - Get low-level information about a volume
+
+# SYNOPSIS
+**docker volume inspect**
+[**-f**|**--format**[=**]]
+
+[OPTIONS] [VOLUME NAME]
+
+# DESCRIPTION
+
+Returns information about a volume. By default, this command renders all results
+in a JSON array. You can specify an alternate format to execute a given template
+is executed for each result. Go's
+http://golang.org/pkg/text/template/ package describes all the details of the
+format.
+
+# OPTIONS
+**-f**, **--format**=""
+   Format the output using the given go template.
+
+# HISTORY
+July 2015, created by Brian Goff <cpuguy83@gmail.com>

man/docker-volume-ls.1.md

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+% DOCKER(1) Docker User Manuals
+% Docker Community
+% JULY 2015
+# NAME
+docker-volume-ls - List all volumes
+
+# SYNOPSIS
+**docker volume ls**
+[**-f**|**--filter**[=**]]
+[**-q**|**--quiet**[=**]]
+
+[OPTIONS]
+
+# DESCRIPTION
+
+Lists all the volumes Docker knows about. You can filter using the `-f` or `--filter` flag. The filtering format is a `key=value` pair. To specify more than one filter,  pass multiple flags (for example,  `--filter "foo=bar" --filter "bif=baz"`)
+
+There is a single supported filter `dangling=value` which takes a boolean of `true` or `false`.
+
+# OPTIONS
+**-f**, **--filter**=""
+   Provide filter values (i.e. 'dangling=true')
+**-q**, **--quiet**=false
+  Only display volume names
+
+# HISTORY
+July 2015, created by Brian Goff <cpuguy83@gmail.com>

man/docker-volume-rm.1.md

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+% DOCKER(1) Docker User Manuals
+% Docker Community
+% JULY 2015
+# NAME
+docker-volume-rm - Remove a volume
+
+# SYNOPSIS
+**docker volume rm**
+
+[OPTIONS] [VOLUME NAME]
+
+# DESCRIPTION
+
+Removes a volume. You cannot remove a volume that is in use by a container.
+
+    ```
+    $ docker volume rm hello
+    hello
+    ```
+
+# OPTIONS
+
+# HISTORY
+July 2015, created by Brian Goff <cpuguy83@gmail.com>