tests are outdates and fail on CRAN

[pbiecek]

i.e. test_jss_artilce contains multiSearchInRemoteRepo

[pbiecek]

On CRAN they have:

** running tests for arch 'i386' ... ERROR
Running the tests in 'tests/testthat.R' failed.
Last 13 lines of output:
testthat results ================================================================
OK: 47 SKIPPED: 0 FAILED: 4

1. Error: asearch works properly

2. Error: loadFromRepo functions works with regular parameters

3. Error: search* functions does search

4. Error: zip*Repo reacts properly on proper arguments

   Error: testthat unit tests failed
   In addition: Warning message:
   'multiSearchInRemoteRepo' is deprecated.
   Use 'multiSearchInRemoteRepo is deprecated. Use searchInRemoteRepo() instead.' instead.
   See help("Deprecated")
   Execution halted

I cannot reproduce these errors

[pbiecek]

Something is wrong with test on Windows
https://cran.r-project.org/web/checks/check_results_archivist.html

[pbiecek]

It turns out that tests fail because of slow internet connection.
Still, I think that tests should not be that heavily based on github.
Should be changes along #249