MetaIO (reduced)

This corresponds to commit hash
  53aa417f83a4c3606b06b673617a1f7b2f3a9f87
from upstream repository
  git@github.com:Kitware/MetaIO.git
ENH: Adding License file from upstream MetaIO
ENH: Adding script to update MetaIO from upstream

Change-Id: I4e51312785cc417eb3939941fbc583fe7e9ec516
ENH: Remove ITK MetaIO to prepare for upstream import

Change-Id: I7f9af5f30c6ed10fd07ff54aa220e3ce4305f40b
Merge branch 'MetaIO-upstream' into MetaIO-update

To initialize this subtree the following command was done:
git merge --no-commit -s ours MetaIO-upstream
git read-tree --prefix=Modules/ThirdParty/MetaIO/src/MetaIO/ -u
MetaIO-upstream

This patch address JIRA issue ITK-3232:
MetaIO reader crashes with empty string values

Change-Id: I27cda7d19bb87d97c28aae43b9c68628d3275033
Merge branch 'MetaIO-update' into release

Change-Id: I39f84454acdfd00727581d02e0d74eb7ee82849d