Fix for IFrameDialog Spinner issue, additional props for IFrameDialog

[AJIXuMuK]

Q	A
Bug fix?	[X]
New feature?	[x]
New sample?	[ ]
Related issues?	#154

What's in this Pull Request?

The PR contains fix of the issue #154 that appeared if IFrameDialog was used with cross-origin requests.
It also contains new props for IFrameDialog that are standard attributes for iframe HTML element

[codecov-io]

Codecov Report

Merging #173 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #173   +/-   ##
=======================================
  Coverage   80.63%   80.63%           
=======================================
  Files          10       10           
  Lines         346      346           
  Branches       71       78    +7     
=======================================
  Hits          279      279           
  Misses         44       44           
  Partials       23       23

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[estruyf]

Thanks @AJIXuMuK for the implemented fix