feat #972 prefix URLs in CSS templates

This commit introduces the possibility to define a method to be used to prefix all the image urls inside css templates.
LCRange Handler Fixes to allow comma pattern
feat #964 Changes for Error tooltip on keydown

close #964
fix #973 Fixing the test because was failing on IE7

Test failing on IE7
fix #974 test.aria.utils.cfgframe.AriaWindowTest failing on IE 8

Commit 2c1141e33deb90e8a5c5cd10676d87b486dd22c4 makes the following
test fail on IE 8: test.aria.utils.cfgframe.AriaWindowTest.
It only happens on a true IE 8 (not on IE 11 in IE 8 mode).

The issue comes from an "Unspecified error" raised when trying to read
Aria.$window.document.activeElement. This commit surrounds that piece
of code by a try ... catch.
1.4.16
fix #980 Correct MultiAutoComplete initialization when bound data is not empty

When freeText option was set to false, items already present in the data model to which the value of the widget is bound were not taken into account.
This commit reverts a fix done for another bug within commit 41d50bfe63ce93bc8d3116d28aeeb753d136b9dd: when freeText is equal to false, type some text for which there is no suggestion. Then blur. Then click inside the field and type something for which suggestions are returned. Pressing ENTER would cause all items to be duplicated.
refactor MultiAutoComplete unit tests

Using class `test.aria.widgets.form.autocomplete.multiautocomplete.BaseMultiAutoCompleteTestCase`, all MultiAutoComplete testcases have been refactored.

Close #982
fix #983 Error tip is now positioned relative to the invalid entry
Merge branch 'master' into drag2