Fixed a bug in JSObjectProxy>>#doesNotUnderstand: The check for
an existing property was evaluating the property content. So
a missing property and an existing property with undefined value
both triggered MessageNotUnderstood.
Fix and tests are included
JSProxyObject >> asJQuery, allows `domObject asJQuery`
Kernel-Tests: add Number>>testHexNumbers
parser: fix range of valid hex chars
Kernel-Tests: add tests for invalid HEX numbers
Merge pull request #302 from herby/dom-asjquery

JSObjectProxy >> asJQuery, allows `domObject asJQuery`
Merge pull request #303 from mkroehnert/hex

fix parsing of hex numbers and add tests for it
Merge pull request #290 from noha/master

JSObjectProxy>>#doesNotUnderstand: treats undefined values as missing selector