Improve Accept HTTP header check for JSON content
Improve Accept HTTP header check for JSON content

With this commit, */* is correctly recognized and HTTP 406 is not
returned anymore for the MIME type application/json

josthkko/ggrc-core,selahssea/ggrc-core,edofic/ggrc-core,kr41/ggrc-core,kr41/ggrc-core,edofic/ggrc-core,andrei-karalionak/ggrc-core,VinnieJohns/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,selahssea/ggrc-core,edofic/ggrc-core,plamut/ggrc-core,j0gurt/ggrc-core,j0gurt/ggrc-core,selahssea/ggrc-core,selahssea/ggrc-core,AleksNeStu/ggrc-core,VinnieJohns/ggrc-core,VinnieJohns/ggrc-core,j0gurt/ggrc-core,kr41/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,josthkko/ggrc-core,kr41/ggrc-core,j0gurt/ggrc-core,plamut/ggrc-core,andrei-karalionak/ggrc-core,AleksNeStu/ggrc-core,VinnieJohns/ggrc-core,andrei-karalionak/ggrc-core,josthkko/ggrc-core,andrei-karalionak/ggrc-core,josthkko/ggrc-core,edofic/ggrc-core