script.dataset is not compatible with ie10

[fifman]

With esriLoader, ie 10 reported the following error:

TypeError, unable to set property 'esriLoader' of undefined or null reference

Then I found that the value of script.dataset is undefined in IE10. After I moved the source out and deleted all the sentences where script.dataset is used, everything worked fine. #

[tomwayson]

Thank you.

I had been thinking that this library should only support IE11, b/c that is what is supported by v4.x of the JSAPI.

However, I forgot that v3.x supports IE9+.

It will not be possible for this library to support IE<11 w/o a contributor that is dedicated to the related changes and maintenance. I personally have no intentions of supporting it.

The README should be updated to reflect that.

[tomwayson]

@fifman this should be fixed as of v1.6.1