Add 'kpod history' command

Signed-off-by: umohnani8 <umohnani@redhat.com>

docs/kpod-history.1.md

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+% kpod(8) # kpod-history - Simple tool to view the history of an image
+% Urvashi Mohnani
+% JULY 2017
+# NAME
+kpod-history - Shows the history of an image.
+
+# SYNOPSIS
+**kpod history [OPTIONS] IMAGE[:TAG|DIGEST]**
+
+# DESCRIPTION
+**kpod history** displays the history of an image by printing out information
+about each layer used in the image. The information printed out for each layer
+include Created (time and date), Created By, Size, and Comment. The output can
+be truncated or not using the **--no-trunc** flag. If the **--human** flag is
+set, the time of creation and size are printed out in a human readable format.
+The **--quiet** flag displays the ID of the image only when set and the **--format**
+flag is used to print the information using the Go template provided by the user.
+
+Valid placeholders for the Go template are listed below:
+| **Placeholder** | **Description**                                                              |
+|-----------------|------------------------------------------------------------------------------|
+| .ID             | Image ID                                                                     |
+| .Created        | if **--human**, time elapsed since creation, otherwise time stamp of creation|
+| .CreatedBy      | Command used to create the layer                                             |
+| .Size           | Size of layer on disk                                                        |
+| .Comment        | Comment for the layer                                                        |
+
+**kpod [GLOBAL OPTIONS]**
+
+**kpod [GLOBAL OPTIONS] history [OPTIONS]**
+
+# GLOBAL OPTIONS
+
+**--help, -h**
+  Print usage statement
+
+# OPTIONS
+
+**--human, -H**
+    Display sizes and dates in human readable format
+
+**--no-trunc**
+    Do not truncate the output
+
+**--quiet, -q**
+    Print the numeric IDs only
+
+**--format**
+    Pretty-print history of the image using a Go template
+
+**--json**
+    Print the history in JSON form
+
+# COMMANDS
+
+**kpod history debian**
+
+**kpod history --no-trunc=true --human=false debian**
+
+**kpod history --format "{{.ID}} {{.Created}}" debian**
+
+## history
+Show the history of an image
+
+# SEE ALSO
+kpod(1), crio(8), crio.conf(5)
+
+# HISTORY
+July 2017, Originally compiled by Urvashi Mohnani <umohnani@redhat.com>