Resume Travis builds and remove karma errors

[rexagod]

Fixes #122, re: #126

Success logs

▶ grunt build
Running "jshint:source" (jshint) task
>> 11 files lint free.

Running "jshint:grunt" (jshint) task
>> 1 file lint free.

Running "karma:development:start" (karma) task

START:
06 02 2019 16:45:54.868:INFO [karma-server]: Karma v3.1.4 server started at http://0.0.0.0:9876/
06 02 2019 16:45:54.870:INFO [launcher]: Launching browsers PhantomJS with concurrency unlimited
06 02 2019 16:45:54.890:INFO [launcher]: Starting browser PhantomJS
06 02 2019 16:45:58.299:INFO [PhantomJS 2.1.1 (Linux 0.0.0)]: Connected on socket LpERJgPzRtZzNKSWAAAA with id 70904612
  L.DistortableImageOverlay
    #_calculateProjectiveTransform
      ✖ Should (skipped)
    getCenter
      ✔ Should return the center when the outline of the image is a rectangle.
  L.DistortableImage.Edit
    ✔ Should be initialized along with each instance of L.DistortableImageOverlay.
    ✔ Should keep handles on the map in sync with the corners of the image.
    ✖ Should keep image in sync with the map while dragging. (skipped)
  L.RotateHandle
    _calculateRotation
      ✔ Should return 0 when given the same latlng twice.
    _calculateScalingFactor
      ✔ Should return 1 when given the same latlng twice.
  L.DomUtil
    .getMatrixString
      ✔ Should
  L.MatrixUtil
    .multmm
      ✔ Should act as the identity when the identity matrix is on the left.
      ✔ Should act as the identity when the identity matrix is on the right.
    .multsm
      ✔ Should scale the identity matrix.
    .general2DProjection
      ✔ Should return the 3*3 identity matrix when each corner is mapped back to itself.
      ✔ Should return a scalar multiple of the 3*3 identity matrix when the image is scaled.

Finished in 0.159 secs / 0.096 secs @ 16:45:58 GMT+0530 (IST)

SUMMARY:
✔ 11 tests completed
ℹ 2 tests skipped

Running "coverage" task

Running "concat:dist" (concat) task

Done.

/cc @jywarren

[jywarren]

Great work!!!! Super -- very exciting! 👍 👍 👍 👍

I changed the description so it doesn't close the planning issue but only the more specific one: Fixes #122, re: #126