Changes release version to 2.7.7

Release version is now 2.7.7.
Updates the changes file
Changes SecUnicodeMapFile in recommend configuration

The parameter was using a deprecated syntax, now it is fixed.
Adds a default config script to nginx
Merge tag 'refs/tags/v2.7.7'
Reverts commit b1cbccdc6b18a0f3a4edda8a5dfa9f6621485e81

This belongs to a specific branch as long as it is not stable yet.