Source won't compile on Unix systems about sparsehash HOT 3 CLOSED

Weird, I thought I had compiled the unittest before I submitted the last SVN
revision, but maybe not.  It does look like I did an incomplete job of adding 
StrHash
as the hash function template-parameter everywhere I was hashing a string.

I believe the fix is to just change
   sparse_hash_map<string, XXX>
to
   sparse_hash_map<string, XXX, StrHash>
and likewise with dense_hash_map.  We also need to change
   sparse_hash_map<char*, XXX>
if any of those occur.

I'll take care of it after I'm back from vacation.  If you'd like to do the 
patch
earlier than that, feel free, and can attach it here!

I've got a fix that works for me, that I'm having reviewed right now.  Once 
it's been 
ok'ed, I'll let you know.  May be next year, though!

This should be resolved in sparsehash 1.6, just released.