UpdateCourseraOnDemandCourses: check the courseStatus field and determine launch date

[deepakjois]

There is now a courseStatus field in the Coursera API, which could be used.

{
  "elements": [
    {
      "id": "qBprGt8cEeWsvwp02yXW0Q",
      "verificationEnabledAt": 1462832756776,
      "promoPhoto": "https://coursera-course-photos.s3.amazonaws.com/f7/f704c0120b11e6899cbff1c40878aa/STEM.jpg",
      "subtitleLanguageCodes": [],
      "courseStatus": "preenroll",
      "isReal": true,
      "isRestrictedMembership": false,
      "isVerificationEnabled": true,
      "categoryIds": [],
      "description": "Welcome to English for Science, Technology, Engineering, and Mathematics! This course is designed for non-native English speakers who are interested in improving their English skills in the sciences. In this course, you will explore some of the most innovative areas of scientific study, while expanding your vocabulary and the language skills needed to share scientific information within your community. In unit 1, you will learn how the scientific method can be used to explore climate change. In unit 2, you will examine research on alternative energy sources. The next unit in the course will focus on the impact of climate change, while unit 4 will explore the applications of nanotechnology. In the final unit of the course, you will demonstrate your increased understanding of STEM topics by through a culminating final project on a science experiment of your choice. \n\nAnyone may take this course for free and get a Statement of Accomplishment issued by the University of Pennsylvania. If you want to get a Coursera Verified Certificate for free, please fill out the Financial Aid form. \n\nDevelopment of this course was funded by the U.S. Department of State Bureau of Educational and Cultural Affairs Office of English Language Programs. Unless otherwise noted, all course materials are available for re-use, repurposing and free distribution under a Creative Commons 4.0 Attribution license.",
      "partnerIds": [
        "6"
      ],
      "isSubtitleTranslationEnabled": true,
      "instructorIds": [
        "599621",
        "18116696"
      ],
      "enrollableSiteUserRoles": [],
      "name": "English for Science, Technology, Engineering, and Mathematics",
      "preEnrollmentEnabledAt": 1466435788454,
      "previewUserIds": [],
      "primaryLanguageCodes": [
        "en"
      ],
      "plannedLaunchDate": "May 2017",
      "slug": "stem"
    }
  ],
  "paging": null,
  "linked": null
}