Add User, Context and Role, from LMS

This release adds the modelsLtiUser, LtiContext and LtiRole.
Those will manage the information that will come from the LMS

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Screenshots:

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TimetableUnits using FullCalendar

This release includes a calendar inside Timetables that shows current events and allows the creation of new ones.

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Timetables inside TC's

This release nest Timetables inside TC's, so when creating a timetable it's no longer necessary choose the TC.
Besides, at the TC 'show' view, now it's possible to manage Timetables that belongs specifically to that TC.
Also includes some security changes, the gem 'better-errors' and some new tests.

GIF:

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Base with all planned technologies integrated

Screenshot :

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This release it will be the base for this application and future ones, it has these technologies integrated :

Technology	Used for
Ruby	As the base programming language
Ruby on Rails 5.1	As the core framework, it manages almost everything of the MVC
PostgreSQL	As the database to store all the data
IMS-LTI	Used to be integrated inside LMS's
Bootstrap 4	To provide lots of front-end utilities
FontAwesome 5	To provide standard icons as CSS classes
GitHub	As the Version Control System
Docker	Used to prevent bugs that only happen under some machines
Heroku	Used to deploy the app to the Internet for free.
RSpec	Used as the core of the testing system
Travis CI	Used to run tests for each commit and pull request

Basic models, decent navbar and base style.

The first iteration of a stable, deployed, decent looking pre-release with basic logic functionalities.

• Need to create a footer to make it whole.

Preview image :

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Authentication and LTI OAuth working

This release uses the Devise gem to authenticate 'Admins' this will be the role that registers the TC's in the app.

Devise provides various facilities like :

• User sign up
• User sign in/out
• Protect actions (web pages) selectively, when accessing a page without being logged shows an error message and render the sign in form, if we fill it with correct information, automatically redirect the user to the previously requested page.

Also includes the IMS-LTI gem, this allows OAuth authentication, using this we can get trusted user information and use it to display different views based on roles and another user, context, and TC data.

Included Bootstrap 4 and Font Awesome 5 for future styling

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Screenshots:

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Hello world

This is just an empty template of a Ruby on Rails app using as DB adapter PostgreSQL

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