fixed profile images' save path

this was necessary because the vir user names are being retired
unify profil and korok domains in configuration (#106)
configuration verification skeleton (#109)
fixed PekWebException's response status
api returns the avatar's url instead of the binary
using byte array for request body in signature check
request signature can be skipped in development
profile image upload
delete profile image
handling empty uploaded image
Merge pull request #111 from kir-dev/profile-img

profile image