Fix certificate issues

[todvora]

Related to #35

[codecov-io]

Codecov Report

Merging #36 into master will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #36      +/-   ##
============================================
- Coverage     47.43%   47.35%   -0.09%     
+ Complexity      115      113       -2     
============================================
  Files            45       45              
  Lines           643      642       -1     
  Branches         31       31              
============================================
- Hits            305      304       -1     
  Misses          330      330              
  Partials          8        8

Impacted Files	Coverage Δ	Complexity Δ
.../cz/tomasdvorak/eet/client/security/ServerKey.java	73.17% <ø> (-0.64%)	9 <0> (ø)

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