feat(ncyBreadcrumbLast): add custom templating

[freethejazz]

Add ability to set a custom template or templateUrl for
ncyBreadCrumbLast. Before, if a custom template that allowed HTML via
ngBindHtml, breadcrumb last would not behave properly since it escaped
HTML by default. A value could be assigned to the ncyBreadcrumbLast
directive to customize the template, but it would have to be done on
each instance of the directive used. Now, a template can be set once via
the templateLast and templateLastUrl properties of the configuration
object passed to $breadcrumbProvider.setOptions.

A few things to point out:

1. ncyBreadcrumb replaces the element the directive is set to, but ncyBreadcrumbLast does not. This means that the custom template that a user sets for ncyBreadcrumbLast will be wrapped by whatever element they added the directive to. This shouldn't be a huge problem, as it's the expected behavior today when assigning a custom value to ncyBreadcrumbLast.
2. I cringed a bit at just copying the two existing methods for getTemplateLast and getTemplateLastUrl, but I think it's probably the best way to go. I thought the added complexity of refactoring those functions for reusability was not worth it, considering they probably won't be used anywhere else. If you want those to be DRYer, let me know and I can do that.
3. I'm not married to any of the identifier names introduced here, so if any of them are displeasing let me know of your desired alternative and I'll change it.
4. In order to pass all the tests, I had to lock the testLatest version of angular to 1.4.9, instead of using the actual latest of 1.5.0. This is due to the fact that angular 1.5.0 causes tests to fail in master.
5. This functionality should be documented once it makes it's way into master.

Closes #123, Closes #125

[freethejazz]

Regarding # 4 above, I did not commit the version lock to the Gruntfile, so integration tests will likely fail on the testLatest run.

[freethejazz]

I've opened a new issue (#135) to address the problem in the above comment

[ncuillery]

Thanks for this well-tested / well-explained PR ! I sounds good to me.

We'll fix CI soon and then merge this one.

[ncuillery]

Hi, can you rebase your PR please ? Tests should be working.

[freethejazz]

Rebased and pushed! Tests worked locally, so I think we might be in the clear. (Let's see what travis has to say about it)

[ncuillery]

Landed, thanks !

I wait few days if recent PR are rebased by their authors, then I release a new version (will be the 0.5.0)