clean up file attributes when transferring vom ExFat to OSX

reset file attributes

# ExFat format marks files without extension as 'Unix Executable'
# to restore original behaviour,
# remove executable bits from files and only set for directories

# recursively remove executable bits from all files
sudo chmod -R -x *
# remove executable bits from all hidden files (e.g. .gitignore)
sudo chmod -R -x .*

# set executable bit for directories (not accessible otherwise)
sude chmod -R +X *
# set for hidden folders
sudo chmod -R +X .*


# recursively reset dropbox attribute
xattr -r -d com.dropbox.attributes *