Node v0.12.x support

[springmeyer]

I see no rush to officially move to node v0.12.x, however taking steps to start testing against node v0.12.x would be wise because:

• 0.12.x might (untested) help solve support for logging on windows via the shell (reverted in Win fix: disable shell logging for windows #1168)
• 0.12.x includes performance improvements that may help large studio exports. In particular windows memory problems resulting from poor GC timing might be addressed by 0.12.x.

To unlock this the C++ module dependencies will need node 0.12.x support/binaries:

• node c++11 build for windows: Node v0.12.x node-cpp11#19
• node-mapnik: io.js and node v0.12.x support mapnik/node-mapnik#394 (needs >= v3.1.6)
  • deps of node-mapnik tagged where applicable: https://github.com/mapbox/mapnik-swoop/blob/353ba2cf307644e46410ae058ead6ba77670f910/package.json#L15-L30
• node-gdal: 0.4.2 release naturalatlas/node-gdal#90 (needs tag)
• node-sqlite3: Upgrade to nan@1.5.0 / Fix compile against io.js TryGhost/node-sqlite3#386 (needs > v3.0.5)
• node-srs: mapbox/node-srs@e2b8011 (needs tag)

[springmeyer]

Been debugging mbstudio vtile exports in person with @BergWerkGIS and @tmpsantos using intel vtune. Preliminary results seem to suggest that windows is launching an extreme number of threads (> 30-40) for exports and causing malloc performance to suffer. Because node v0.12.x uses a libuv version with a new model for threads on windows, I'm picking up this ticket to push it over the edge. The last remaining module needing a tag with node v0.12.x support is node-srs so that is next up.

[springmeyer]

@BergWerkGIS - node v0.12.x seems to work: https://travis-ci.org/mapbox/mapbox-studio/builds/58828609. Branch in place to start testing at https://github.com/mapbox/mapbox-studio/compare/node-v12?expand=1.

But for your local testing purposes all you need is latest mb-pages branch.

Be aware that https://github.com/mapbox/mapbox-studio/blob/mb-pages/scripts/vendor-node.sh is currently broken but this script is not run on windows, so not a blocker.

[wilhelmberg]

using node 0.12.0 with mb-pages gives: