Fix jshint/karma errors and duplicate code from #100

[rexagod]

Cleans up #100, and fixes some build errors that appeared after the cleanup.

JSHint logs

Running "jshint:source" (jshint) task

   src/edit/DistortableImage.Edit.js
    335 |    _toggleExport: function (){
                          ^ Duplicate key '_toggleExport'.

>> 1 error in 11 files
Warning: Task "jshint:source" failed. Use --force to continue.

Aborted due to warnings.

Karma logs

Running "karma:development:start" (karma) task
22 02 2019 01:09:54.219:ERROR [config]: Error inconfig file!
 TypeError: Path must be a string. Received null
  at assertPath (path.js:28:11)
  at Object.extname (path.js:1456:5)
  at phantomJSExePath (/home/champagnepapi/Desktop/workspace/ldi/node_modules/karma-phantomjs-launcher/index.js:18:12)
  at Object.<anonymous> (/home/champagnepapi/Desktop/workspace/ldi/node_modules/karma-phantomjs-launcher/index.js:107:12)
  at Module._compile (module.js:652:30)
  at Object.Module._extensions..js (module.js:663:10)
  at Module.load (/home/champagnepapi/Desktop/workspace/ldi/node_modules/coffeescript/lib/coffee-script/register.js:45:36)
  at tryModuleLoad (module.js:505:12)
  at Function.Module._load (module.js:497:3)
  at Module.require (module.js:596:17)
  at require (internal/module.js:11:18)
  at module.exports (/home/champagnepapi/Desktop/workspace/ldi/test/karma.conf.js:14:7)
  at Object.parseConfig (/home/champagnepapi/Desktop/workspace/ldi/node_modules/karma/lib/config.js:393:5)
  at new Server (/home/champagnepapi/Desktop/workspace/ldi/node_modules/karma/lib/server.js:66:24)
  at Object.<anonymous> (/home/champagnepapi/Desktop/workspace/ldi/node_modules/grunt-karma/tasks/grunt-karma.js:140:20)
  at Object.<anonymous> (/home/champagnepapi/Desktop/workspace/ldi/node_modules/grunt/lib/grunt/task.js:252:15)
  at Object.thisTask.fn (/home/champagnepapi/Desktop/workspace/ldi/node_modules/grunt/lib/grunt/task.js:70:16)
  at Object.<anonymous> (/home/champagnepapi/Desktop/workspace/ldi/node_modules/grunt/lib/util/task.js:294:30)
  at Task.runTaskFn (/home/champagnepapi/Desktop/workspace/ldi/node_modules/grunt/lib/util/task.js:244:24)
  at Task.<anonymous> (/home/champagnepapi/Desktop/workspace/ldi/node_modules/grunt/lib/util/task.js:293:12)
  at /home/champagnepapi/Desktop/workspace/ldi/node_modules/grunt/lib/util/task.js:220:11
  at _combinedTickCallback (internal/process/next_tick.js:131:7)
  at process._tickCallback (internal/process/next_tick.js:180:9)

[rexagod]

Pinging @jywarren.

[jywarren]

Ah thanks and sorry for the mess!