Updated versions of WFK and EAP in README.md files

Added EAP 6.3 to the list of the supported versions
find ./ -name "README.*" | xargs -I {} sed -i "s/EAP 6\.2,/EAP 6\.2, EAP 6\.3,/g" {}
changed WFK version to 2.7
find ./ -name "README.*" | xargs -I {} sed -i "s/2\.6/2\.7/g" {}