remove submodules
Squashed 'static/nvd3/' content from commit 6616c9e

git-subtree-dir: static/nvd3
git-subtree-split: 6616c9e9314a73ed7d23a76eda8e82ecc697630b
Merge commit 'e3e8f915d5805708ceaeb162878455475b372f93' as 'static/nvd3'
Squashed 'static/saveSvgAsPng/' content from commit dbfaff1

git-subtree-dir: static/saveSvgAsPng
git-subtree-split: dbfaff10a6e76b41e97a726adf13523e91e8b699
Merge commit '281d301285221398d2fae12c5370d49ed05b58e6' as 'static/saveSvgAsPng'