Add .dropboxignore directory to exclude folders without using selective sync

these conflicts are getting really pesky, and even though I have script to go and set the attribute to ignore to a set list of folders... the behavior is still wonky and it is easy to do a slipup with the timing of when you need to do a combination of: sync, crate folders with same name that are local, ignore those local folders, resync. Especially when doing it across several devices. And one slip up will corrupt the entire Dropbox repo with conflicts. Really need a fix to this, this should be a simple feature (other software does this like GitHub).