Page container: the load method now correctly returns a promise

[marcuskrahl]

The API docs for version 1.4.0 state that the load method of the pagecontainer widget returns a promise. This commit adds this behaviour to the widget to comply with the docs

Fixes #6900

[arschmitz]

@mk747gx it looks like you have not signed our cla can you please sign the CLA at http://contribute.jquery.org/CLA/ you will also find other useful information about contributing in general at http://contribute.jquery.org/ Let us know once you have signed and and then we can take a look at this.

[marcuskrahl]

@arschmitz I signed the CLA as requested

[arschmitz]

This fix looks good just one last thing is the commit message needs to be updated to our new commit message guidelines http://contribute.jquery.org/commits-and-pull-requests/#commit-guidelines

[marcuskrahl]

I changed the commit message. Hopefully it now fulfills the commit guidelines (if not just tell me what I missed). I initially followed CONTRIBUTING.md which seems to have different rules than the link you provided. So maybe CONTRIBUTING.md needs an update.

[scottgonzalez]

@mk747gx I'm in the middle of updating CONTRIBUTING.md for all projects. This will be fixed within a few days. Sorry for the confusion.

[arschmitz]

@mk747gx can you please change your git config to have your real name and email matching what you signed the CLA with after that i can take a look at getting this merged

[marcuskrahl]

@arschmitz should be fixed now

[coveralls]

Coverage increased (+0.0%) when pulling 1039f02 on mk747gx:pagecontainer_load_returns_promise into 1dc34cc on jquery:master.