Merge pull request #705 from enyojs/ENYO-3082

ENYO-3082: feed review comments from ENYO-3082-2 into ENYO-3082
ENYO-3587: update Ares with enyo/layout/onyx libs to 2.3.0-rc3 version, extra and ace-builds to their related HEAD
start working on 0.2.9-pre.3
This is implementation of JIRA https://enyojs.atlassian.net/browse/ENYO-3638. The following is implemented:
- if an icon or a splash has no height/width specified, no such attribtue should be generated in config.xml
- we should only add a platform specific icon/splash element in `config.xml` if such a specific item has been selected by operator
- the `role` attribute is no longer needed/meaningful in `cordova.xml` therefore it is no longer generated.
Merge branch 'master' of github.com:enyojs/ares-project into ENYO-3638
Revert "start working on 0.2.9-pre.3"

This reverts commit 4af53c1ceab3b096be447405fd39473ba07d54ca.
Merge remote-tracking branch 'origin/ENYO-3082-2'
Start working on 0.2.10-pre.1
Merge pull request #708 from enyojs/ENYO-3638

ENYO-3638: Config.xml: Remove default value on the height width images attributes
Merge pull request #706 from enyojs/ENYO-3587

ENYO-3587: libraries update
Merge remote-tracking branch 'origin/master' into ENYO-3622