[horde] Composer realization

[Mike]

When installing the recent stable version of Horde 6, I ran into an  
issue installing horde/ingo.

This is because packagist doesn't consider anything with RC and other  
things as "stable", so tries to install the latest stable which is  
currently 3.2.16.

This produces a dependency error on PHP.

This isn't a blocking issue, and can be worked around by using,  
--ignore-platform-dep, an explicit version (this seems best) or  
changing your minimum-stability RC

So even though the latest RC was released a week ago, Packagist.org  
won't serve it automatically with minimum-stability stable (this seems  
best)


Most of you probably already know this, but just thought I'd share.