filter out undefined values for IE style.height/width [fix 2529575]

declare feature tests in dom-style-ie.js and ie-style-test.js

fixes feature test for filter

use feature tests to trigger dom-ie-style

move generateID implementation to DOM/Node [fix 2528671]

replace alpha filter string instead of setting value [fix 2528639]

moves _getOffset and getAttrOffset to dom-style

broke out dom-style-ie as conditional module