remove Eclipse specific files + add them into .gitignore

[AlexElin]

[codecov-commenter]

Codecov Report

Merging #257 (d279459) into develop (44c761e) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #257   +/-   ##
==========================================
  Coverage      70.37%   70.37%           
  Complexity      1524     1524           
==========================================
  Files            146      146           
  Lines           8654     8654           
  Branches        1396     1396           
==========================================
  Hits            6090     6090           
  Misses          1976     1976           
  Partials         588      588           

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