Add available scheme to CodeSchool url

[AlexandrSorokin]

Description of changes

Before saving CodeSchool to the database, it takes the following steps: 1) Substitutes the protocol http in url without protocol 2) Make HTTP call to url with https 3) If https is not available, then change protocol to http

The http call slows down saving to the database. It can be avoided by using only the http protocol. This is my first commit to an open source project, so please tell me what I am doing wrong if you can :blush:

Issue Resolved

Fixes #436

[apex-omontgomery]

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