Failing reprojection test

[springmeyer]

Both @GretaCB and I encountered a failing test that looks like:

not ok 9 shp-index projected to spherical mercator
  ---
    operator: ok
    expected: true
    actual:   false
    at: DatasetLayers.defaultForEach [as forEach] (/Users/dane/projects/preprocessorcerer/node_modules/gdal/lib/gdal.js:80:7)
  ...

@GretaCB found she could workaround by pinning node-gdal: https://github.com/mapbox/preprocessorcerer/commit/a3953871514e5c466b4e9ff39cd0682a455a1d83

But what looks like is happening is:

• node-gdal isSame was broken and is now fixed
• so this test should have been failing with node-gdal 0.7.0 but was not
• the test is failing because it asserts that the file is reprojected, but it was not
• the file is not being reprojected because the shp-reproject pre-processor is disabled after https://github.com/mapbox/preprocessorcerer/pull/34