fix #903 Fixing paste on selectbox. Closes #904

Fixing paste action with a valid text when the allowInvalidText is set to false.
Revert "fix #903 Fixing paste on selectbox. Closes #904"

This reverts commit 0ebf3e51e68611c5d4b9939b19c51a0ae7ebbcbd.
Revert "fix #868 Introducing allowInvalidText property for Selectbox widget"

This reverts commit 7d4cf63be5a9ce9be653cdd02dc133de0ad3fcae.
v1.4.14
fix #906 Change in LCRangeResourcesHandler for IE7 issue
feat #911 Form serialization method

A new method is available in singleton aria.utils.Html. It allows to serialize forms in order to use standard ajax calls to submit them.

Close #911.
fix #864 remove DPI test from css.Units constructor

This commit also adds an additional check for a related error when
the developer is calling `preloadSkinImages` from <HEAD>.

Close #909.
fix #917 Remove unnecessary body focus in aria.templates.TemplateCtxt.$focus

This one broke test.aria.templates.keyboardNavigation.TableNavTestCase on IE <= 8