issue with setTrackerOptionInt()

[kalwalt]

while developing this feature #15 and trying to set setThreshold(value) i get this error:

TypeError: Cannot convert "[object Object]" to int
    at Object.toWireType (artoolkitx.js:6)
    at Object.setTrackerOptionInt (eval at new_ (artoolkitx.js:6), <anonymous>:7:26)
    at ARController.setThreshold (artoolkitX.api.js:521)
    at simple_image.html:37
    at Object.Module.onRuntimeInitialized (artoolkitx.js:6)
    at doRun (artoolkitx.js:6)
    at run (artoolkitx.js:6)
    at runCaller (artoolkitx.js:6)
    at removeRunDependency (artoolkitx.js:6)
    at receiveInstance (artoolkitx.js:6)

i fixed this error in setThreshold() but we need to check if other part of artoolkitX.api.js is affected by this issue.
I will list here other possible functions affected by it.