Update LICENSE

Change LICENSE from GPL to MIT
Revert "Add IntelliJ IDEA .iml file to .gitignore"

This reverts commit 261126a17b0b2b79f90f388cd56461acb77b7ad0.
Remove old CSS
Improve Client class.

* Add commas before each newline in address.
* Add spaces to contact numbers to make them easier to read.
Use $client->fullname property in list of clients
Add the ability to view client details.

Closes #2.
Improve estimate list page
Remove unnecessary code from Estimate __construct() method
Add the ability to view previously created estimates.

Closes #4.
Amend home screen layout
Create a ToDo
Add Users->get() method
Add the ability to list users in the system.

Closes #5.
Add the ability to view previously created users.

Closes #6.
Update DB schema
Improve layout of create client screen
Improve layout of create estimate screen
Improve layout of create user screen
Add the ability to edit clients in the system.

Closes #7.
Merge branch 'master' into demo