New Training Session

Things to review in this pull request:
* Added route for loading new training session screen
* Added route for loading main page
* Added route for get specific training session
* Added route for adding training session to db
* Registered route for loading a training session
* Added id to form on new-session.ejs
* Added field uuid to register uniqueness
* Made each field required so user must fill in all entries before submission
* Added training-session.js with uuid generator and handler for submission

@rglynn22 @britte @oidowu @jdrodman Please review the code changes and merge when you confirm that there is no issue.