Add license name to published project REST API

[bemoody]

It's helpful to have information about project licenses in (somewhat) machine readable form. This is already included in the list of all projects (/api/v1/project/published/); add it to the per-project information (/api/v1/project/published/demoeicu/2.0.0/) as well.

Example

{
   "abstract" : "<p>The eICU Collaborative Research Database is a large multi-center critical care database made available by Philips Healthcare in partnership with the MIT Laboratory for Computational Physiology.</p>",
   "compressed_storage_size" : 3090,
   "doi" : "10.13026/G2F309",
   "license" : {
      "name" : "PhysioNet Credentialed Health Data License 1.5.0"
   },
   "main_storage_size" : 3195,
   "project_home_page" : "https://eicu-crd.mit.edu/",
   "publish_datetime" : "2018-12-17T16:11:17.040000-05:00",
   "short_description" : "",
   "slug" : "demoeicu",
   "title" : "Demo eICU Collaborative Research Database",
   "version" : "2.0.0"
}

[tompollard]

looks good to me!