feat #1231 Highlighting the selected options in selectbox widget

This commit makes the selected option highlighted when clicked on dropdown
of selectbox widget
close #1231
fix #1021 getElementsByClassName discrepancy in Fx 3.6

Modern browsers, and IE7+ coerce the class parameter to a string
automatically, it was not the case in Firefox 3.6.

Close #1246.
1.6.3
fix #1249 Updating type check for Array

The check for array was not working properly, this commit change the condition in order to use the aria.utils.Type.isArray method instead.
feat #1235 Add grunt tasks to ease packaging

This commit introduces
- a grunt multi-task (`atbuild`) that allows to simply re-package aria templates source code. It is also used internally for the production build of the framework.
- a grunt multi-task (`easypackage`) that allows to create packages for an aria templates-based application. It simplifies the configuration that is generally needed in order to achieve this goal by exposing a simple API to the developer.

These tasks are now available in any project including the framework. The necessary files are published to npm along with the framework and there is no need to explicitly add atpackager or noder-js as dependencies in order to execute them.

Close #1235
feat #1253 Correct interpretation of dates with localized months

Localized months were not recognized as valid inputs of the `aria.utils.Date.interpret` method.
This means that whenever the user selected a date in a DatePicker with output pattern containing "MMM" or "MMMM" (meaning with the localized short or full month), and then just changing, for example, the year, the entry could not be recognized.

This commit adds this feature. Also, the special case 04DEC/+13 now supports localized dates and the presence of spaces between day, month and year.

Close #1253
fix #1255 fixing path to the Java Robot applet

This commit fixes the regular expression which was used
to detect absolute URLs. URLs starting with a slash are
now considered absolute, they are not relative to the
<base> tag.
fix #1256 Inhibit leading indentation check on output mocha test files

This commit inhibits the leading indentation check on some files that are the output of some mocha tests.
fix #1257 Wrong order of dayShort in Japanese

close #1258