Test against jQuery 1.11, and 2.1.
Merge branch 'master' into 0.9.x
Use $.prop() instead of $.attr() when touching disabled property.
Abort previous xhr request in case new one is triggered.

This is to avoid unexpected results of xhr requests finishing in different order that they were launched.
Option to clear the children immediately after parents are changed, without waiting the return of the request.
Merge branch 'patch-2' of https://github.com/thiagotalma/jquery_chained into thiagotalma-patch-2
Rename clear_children to reset. Optional loading message.
Move changelog to releases.
Rename reset to clear.
Emulate slow queries when asked.
Use Sinon fake server. Make tests properly async.
Add tests for clear and loading.
Prepare for 0.9.10