Update endians.nim

adds swapEndian16 function
Koch now uses PATH/nimrod correctly
Merge pull request #812 from girvo/koch-fix

Koch now uses $PATH/nimrod correctly
Merge pull request #775 from fowlmouth/patch-3

Update endians.nim
master compiler compiles with devel
Optimized the size of PNG images. 172KB > 143KB

Used optpng + pngout + deflopt.
Merge pull request #839 from ReneSac/master

Optimized the size of PNG images. 172KB > 143KB
Merge remote-tracking branch 'araq/master'