Working at force that the user to enable authy on the next login
Add verify authy installation page

- Without styles
added helpers file

Signed-off-by: Johanna Mantilla Duque <johanna1431@gmail.com>
Merge remote-tracking branch 'origin/helpers' into force-enable-authy
Added the verify installation page

- Without styles
Working at design
Send SMS token
Fix indentation

Change tabs to spaces
Add styles to authy verify installation page
Force send SMS when click on Request SMS link
Verify signature for enable authy
Refactor code

- Validate that user hasn't authy id for enable authy
- Save authy id as temporal for using on verify installation page
Prevent extra clicks on request sms link

Disable link while the ajax request hasn't finished.
Clean up the authenticate_user function
Applying the WordPress Coding Standards

using the plugin
https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards
Code refactor.

Some methods still need to be refactored.
Fixed name of variable for settings
Fix error: The plugin generated x characters of unexpected output during activation.
Create a new method to set the authy data.
Moved the html on get_user_modal_via_ajax() to helpers file