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CRAN release build and add info on release
## What changes were proposed in this pull request?
Changes to DESCRIPTION to build vignettes.
Changes the metadata for vignettes to generate the recommended format (which is about <10% of size before). Unfortunately it does not look as nice
(before - left, after - right)
![image](https://cloud.githubusercontent.com/assets/8969467/20040492/b75883e6-a40d-11e6-9534-25cdd5d59a8b.png)
![image](https://cloud.githubusercontent.com/assets/8969467/20040490/a40f4d42-a40d-11e6-8c91-af00ddcbdad9.png)
Also add information on how to run build/release to CRAN later.
## How was this patch tested?
manually, unit tests
shivaram
We need this for branch-2.1
Author: Felix Cheung <felixcheung_m@hotmail.com>
Closes #15790 from felixcheung/rpkgvignettes.
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