Checkout naming clarification about library HOT 5 CLOSED

@pilloPl What do you propose?

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The reason for this issue to be opened is a confusion we faced at some point. Let me describe it. It was hard for me to distinguish notions of collect, checkout and return. It turned out to mess our discussions, so we finally found some sources that clearly state, that in the context of book lending, libraries, the checkout is actually equal to collect (go to the library, take the book, go home), not to return as one (including me) could think. Regarding the code, checkout is used properly, but I believe we should get rid of the collect part both from model and from code, replacing any occurrence with word checkout. @pilloPl please correct me if I'm wrong

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@bslota Okay, so if @pilloPl approves, I will be working on this.

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@bslota @pilloPl Here is the PR #27 for required changes.

All integration & unit tests are passing.

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@bslota @pilloPl Conflicts are resolved and PR is updated. Please review.

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