Multiple newlines are generated during templates processing

[dmvolod]

Fixes #74

Also small issues fixed:

• execution permissions for generated files (changed for folder instead of file by missprint #72)
• binary generating with Build in the mage file (for dev build)
• generating missing testData README.md file for the lang/function folder

[codecov-commenter]

Codecov Report

Merging #75 (6039ba2) into master (4118600) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   67.82%   67.82%           
=======================================
  Files          17       17           
  Lines        1557     1557           
=======================================
  Hits         1056     1056           
  Misses        415      415           
  Partials       86       86           

Impacted Files	Coverage Δ
cmd/gomarkdoc/output.go	50.49% <0.00%> (ø)

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