[READY] Email checklisting

[andehr]

• New Spring Boot dependency for sending emails from the app.
• EmailService houses its functionality. Currently can send plain or html text.
• First use in the check shell command - there is now a notion of a source "failing/passing" overall, and an email with the check table will be sent in the event of a fail.
  • If sitemaps are disabled, then missing sitemaps does not count as a fail
• The ConfigService now houses application-wide properties. You can configure them in application.properties:

crawler.configservice.email=
crawler.configservice.workingDir=test
crawler.configservice.scraperDir=/home/sw206/git/alced-scrapers
crawler.configservice.userAgent=CASM Tech
crawler.configservice.maxDelay=10

• The EmailService is also configured in application.properties:

  # Properties for setting up app's ability to email out
  spring.mail.host=smtp.gmail.com
  spring.mail.port=587
  spring.mail.username=**************
  spring.mail.password=***************
  spring.mail.properties.mail.smtp.auth=true
  spring.mail.properties.mail.smtp.starttls.enable=true

Closes https://github.com/CASM-Consulting/springcrawler/issues/31 Closes https://github.com/CASM-Consulting/springcrawler/issues/30