Better documentation for logplex_shard replacement.
Split token load/index with logplex_token:load/1.
Add r/w concurrency true to token tables.
Adds logplex_token:reindex_tokens/0.
Whitespace fixes.
Split create_token into find/create.
Adds logplex_token:num_records().
Move token indexing to end of load.
Fix massively retarded token indexing bug.
Replace token index with ordered_set implementation.

For SPEEEEEEEED.
Better nsync token index reporting.
Deletes are by key, not by rec.
Have the ELB healthcheck check for health.
Ignore redis pings (for now).
Test token indexing.
Fix bogus logplex_token:delete/1.
Move logplex_token:lookup_by_channel/1

Now near other by_channel functions.
Simplify delete_by_channel.

Lookup tokens first, then delete. Will be slower for bulk by_channel deletes, but we don't do that now.
Merge branch 'v67'