Use os_app_info to find the proper path for the breadcrumbs now rather than using the old hardcoded path function.  #442
Remove the hardcoded items for creating breadcrumb titles for content types, use the info in app_info to generate the titles.  Class material and software release are still hardcoded since they are fields and not content types and if we were to use the path, it would end up being Home/Software/Foo/Software which would read incorrectly.  #442
Merge pull request #1963 from openscholar/442-breadcrumb-update

Use os_app_info to get the paths and titles for the breadcrumbs.