Windows build on appvayor takes a long time

[ry]

It does an unnecessary npm install of node-gyp ts-node typescript (12 seconds)

The git submodule checkout takes 40 seconds

[00:00:12] Uninstalling node 4.8.7 (x86)...
[00:00:13] Installing node 8.10.0 (x64)...
[00:00:13] npm install -g node-gyp ts-node typescript
[00:00:25] C:\Users\appveyor\AppData\Roaming\npm\node-gyp -> C:\Users\appveyor\AppData\Ro
[00:00:25] C:\Users\appveyor\AppData\Roaming\npm\ts-node -> C:\Users\appveyor\AppData\Roa
[00:00:26] C:\Users\appveyor\AppData\Roaming\npm\tsc -> C:\Users\appveyor\AppData\Roaming
[00:00:26] C:\Users\appveyor\AppData\Roaming\npm\tsserver -> C:\Users\appveyor\AppData\Ro
[00:00:26] + [email protected]
[00:00:26] + [email protected]
[00:00:26] + [email protected]
[00:00:26] updated 3 packages in 5.175s
[00:00:45] git submodule update --init --recursive --depth=1
[00:00:45] Submodule 'deps' (https://github.com/propelml/propel_deps.git) registered for
[00:01:02] Cloning into 'C:/propel/deps'...
[00:01:20] Submodule path 'deps': checked out '3c66288cc4d8627c1cbfbe61ae9f79c34f21e908'
[00:01:20] npm rebuild puppeteer
[00:01:25]
[00:01:25] > [email protected] install C:\propel\node_modules\puppeteer
[00:01:25] > node install.js
[00:01:25]
[00:01:28]