fix #570 Wrong content type in IE 8 with asyncFormSubmit.

In IE 8, setting the enctype attribute of a form with the
following line does not work:
 form.enctype = value;

The following line works better:
 form.setAttribute("enctype", value);
fix #572 Exception when accessing history.state in IE 10

Accessing history.state sometimes raises an exception in IE10,
instead of returning null.
This fix surrounds accesses to history.state with try / catch
blocks.
fix #571 "this.__delegateMapping is null" when unloading a page

The exception "this.__delegateMapping is null" could happen in some
cases when unloading a page. This commit fixes this small issue.
fix #573 Style tag reload for html:Template

Calling the getCSSClassNames method of the template context in the initWidget of the html:Template widget was causing a further style tag reload, with a significant performance degradation.

Storing the classnames while writing the markup allows for an optimization of style tags reloads, which is done through the CSSMgr stop/resume mechanism.
refactor moving remaining tests

Publish all other widget tests

Close #549
fix #550 reorder some tests

Change order of the tests so the long ones do not block the whole campaign
at the end. Speeds up the whole campaign by ~20s (from 2m10s to 1m49 on my
machine) on 8 CPUs.

Related to #538.
refactor Drag tests

1. Removed tolerance which was hiding problems in IE8 and changed the test
environment (increased border size to 15px) to underline the problems in IE8
2. assertTrue etc. -> assertEquals
3. Extracted abstract class to handle shared code
4. Renamed files to follow the unwritten convention that Test means an
executable test, while TestCase - abstract shared class

Close #544.
fix #568 Wrong animation callend in slide transition 3d

The slide transition was adding different animation when the slide transition was called using the 3d version. Now it uses the same ease-out animation.
feat #567 @html:RadioButton

The Radio button HTML widget with 3 properties
-'name': Radio buttons with the same name will be in the same radio group.
-'value': representing the data behing the widget
bindable property: 'selectedValue', representing the radioButton to select.

US 1984. Close #567.
refactor the html input elements
feat #551 Allow any type in TextInput widget

Allow the use of any html5 type in html TextInput widget

Close #551
fix #577 Problem with vertical scrollbar inside selectbox widget when popupWidth = -1

When the popupWidth is equals to -1 the vertical scrollbar hides part of the selectbox popup content due to a problem with the overflow-y sets to Auto. With overflow-y equals to scroll it works fine.