context is irrelevent for json-ld
extract serialized json-ld
Revert "context is irrelevent for json-ld"

This reverts commit 200800ef29454c066ee3d972d7b39a696d4e8653.
ensure context is added to object
keep context first
add tests for serilizing to turtle
binding redirect
remove version assembly info
ignore version assembly files
turtle serialize with local context
refactor json ld converter
appveyor paket restore