Issue #50 and #51 : fix various bugs and add unit tests #1
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preply#52
This should address issues preply#50 and preply#51 (and more).
This is quite a big MR but when I tried to use the library I faced various bugs.
I added a bunch of unit-test in order to make sure I fixed all the things I have found... but it would be worth to add even more.
I have moved the CI to TravisCI.