Add database backups to project folders.

I've added support for database backups within project folders. Especially useful if you are tracking your project in git. No more sending the database separately! 

Works out of the box for projects created with the [VVV-Site-Wizard](https://github.com/aliso/vvv-site-wizard) and can be leveraged in projects whose folder name and database are the same.
Eg. `{vvv}/www/myproject/` and `myproject.sql`.

If the names do not match up, a warning "error" is thrown and the script continues.

I also added color coding and formatting to the output to make things prettier in the shell. 

Readme file was updated to explain the seemingly hidden feature to new users.

Traditional backups to `{vvv}/database/backups/` still work as expected.