Change Element.size() to Element.length() in appcontainer-driver.js

[kood1]

jQuery has deprecated size() and encourages length attribute to be used instead. We should change our size() method to length() and use .length in the eval call.

We need to make the change in following files:

• msl-client-browser/appcontainer-driver.js
• test/msl-clien-browser/spec/MSLTestSpec.js

[kood1]

Not too critical since we are using specific version of jQuery which has this method