Merge pull request #23 from TomSweeneyRedHat/dev/tsweeney/manpages/1

First of several submits for buildah manpages

docs/Makefile

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+GOMD2MAN = go-md2man
+
+docs: $(patsubst %.md,%.1,$(wildcard *.md))
+
+%.1: %.md
+	$(GOMD2MAN) -in $^ -out $@

docs/buildah-from.md

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+## buildah-from "March 2017"
+
+## NAME
+buildah from - Creates a container image based on the supplied image name. If the supplied image name is "scratch" a new default empty container image will be created. 
+
+
+## SYNOPSIS
+**buildah** **from** --image *imagename* [*options* [...]] 
+
+## DESCRIPTION
+Creates a working container based upon the supplied image name.  If the supplied image name is "scratch" a new default container will be created.
+
+## OPTIONS
+
+**--pull**
+Pull the image if it is not present.  If this flag is not specified,the image will not be pulled regardless.  Defaults to TRUE.
+
+**--pull-always** 
+Pull the image even if a version of the image is already present.
+
+**--registry** *registry*
+A prefix to prepend to the image name in order to pull the image.  Default value is "docker://"
+
+**--signature-policy** *signaturepolicy*
+The path of the for the signature policy file.  The default location is */etc/containers/policy.json* and changing to another file is not recommended.
+
+**--mount**
+The working container will be mounted when specified.
+
+**--link** link
+Path name of a symbolic link to create to the root directory of the container. 
+
+
+## EXAMPLE
+**buildah from --image imagename --pull --registry "myregistry://" --mount **
+**buildah from --image imagename --mount --link ~/mycontainerroot --signature-policy /etc/containers/policy.json **
+**buildah from --image imagename --pull-always --registry "myregistry://" **
+
+## SEE ALSO
+buildah-list(1)