User & Coach sign up forms don't reject wrong submissions

[jendiamond]

Pull Request #81

The users/new and the coach/new sign up forms don't reject wrong submissions.

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Add validations

app/models/coaches.rb

class Coach < ApplicationRecord
  validates :first_name, presence: true
  validates :first_name, length: { minimum: 2 }
  validates :first_name, length: { minimum: 30 }
  validates :last_name, presence: true
  validates :last_name, length: { minimum: 2 }
  validates :last_name, length: { minimum: 30 }
  validates :email, presence: true
  validates :days, presence: true
  validates :operating_system, presence: true
end

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http://guides.rubyonrails.org/active_record_validations.html
http://stackoverflow.com/questions/16725010/rails-simple-form-validation