Bump version to 0.23
[Download] Fix URL property issue

Bug-tracking: https://crosswalk-project.org/jira/browse/XWALK-599
[Bluetooth] Fix wrong format for attributes in the service XML

All the attributes values should have been enclosed in '"', and the
attributes should have the proper terminators '/>'.

The error was introduced when fixing the coding style.
Merge pull request #235 from deqing/fix-url-property

[Download] Fix URL property issue
[Download] Add listener type checking

Bug: https://crosswalk-project.org/jira/browse/XWALK-601
[Download] Fix network type checking

It is ok to set networktype to null, as it is optional.
And no need to throw exception if trying to set invalid value
(according to spec).
Bump version to 0.24
Merge pull request #238 from deqing/fix-networktype-checking

[Download] Fix network type checking
Merge pull request #237 from deqing/fix-listener-type-checking

[Download] Add listener type checking
Bump version to 0.25
[Tizen] Fix trying to define properties on a undefined object

When the extension is loaded, the object 'tizen' where the extension
code is referring to may not exist yet, it is only guaranteed to exist
after the extension is loaded. So instead of referring to the 'tizen'
object we need to refer to it as 'exports' that will be translated to
'tizen' after the extension is loaded.
Merge pull request #239 from vcgomes/fix-tizen-extension-undefined-object

[Tizen] Fix trying to define properties on a undefined object
Merge pull request #236 from vcgomes/bluetooth-fix-register-rfcomm-service-by-uuid

[Bluetooth] Fix wrong format for attributes in the service XML
Bump version to 0.26
Added Tizen filters and Call History extension