Merge topic 'DoxygenWithITKTagsDuringBuild'

ef3b3f09 Patch to remote -k flag for gzip
22b9f5b4 ENH: Perform download of ITK tag file during build time
Merge topic 'SIMPLEITK-543_UpgradeITKTowards4.6'

704c92c3 Updating ITK tag along 4.6.0 release
Merge branch 'FixVisibilityWarning' into release

* FixVisibilityWarning:
  Hide visibility warnings

Change-Id: I0966a9f98b3db9c9452a6c86421497ce75078b59
Merge branch 'release'

Change-Id: I7629ad6cc09929a3d93e2ec07e6074c723494520
Merge branch 'master' into next

Change-Id: Ibe13693d013121f1793c4c872ace60286e756b89