TODO file removed.

The list of things to do is since long time in two places:

1) Github issues.
2) I've a private TOOD list of random ideas, what makes sense is later
moved to github issues. So github is anyway the true source of things to
do.

TODO

-Redis TODO
-----------
-
-WARNING: are you a possible Redis contributor?
-         Before implementing what is listed in this file
-         please drop a message in the Redis google group or chat with
-         antirez or pietern on irc.freenode.org #redis to check if the work
-         is already in progress and if the feature is still interesting for
-         us, and *how* exactly this can be implemented to have good changes
-         of a merge. Otherwise it is probably wasted work! Thank you
-
-
-CLUSTER
-=======
-
-* Implement rehashing and cluster check in redis-trib.
-* Reimplement MIGRATE / RESTORE to use just in memory buffers (no disk at
-  all). This will require touching a lot of the RDB stuff around, but we may
-  hand with faster persistence for RDB.
-* Implement the slave nodes semantics and election.
-* Allow redis-trib to create a cluster-wide snapshot (using SYNC).
-* Allow redis-trib to restore a cluster-wide snapshot (implement UPLOAD?).
-
-SCRIPTING
-=========
-
-* SCRIPT FLUSH or alike to start a fresh interpreter?
-
-OPTIMIZATIONS
-=============
-
-* SORT: Don't copy the list into a vector when BY argument is constant.
-* Write the hash table size of every db in the dump, so that Redis can resize the hash table just one time when loading a big DB.
-* Read-only mode for slaves.
-* Redis big lists as linked lists of small ziplists?
-  Possibly a simple heuristic that join near nodes when some node gets smaller than the low_level, and split it into two if gets bigger than high_level.
-
-KNOWN BUGS
-==========
-
-* #519: Slave may have expired keys that were never read in the master (so a DEL
-  is not sent in the replication channel) but are already expired since
-  a lot of time. Maybe after a given delay that is undoubtably greater than
-  the replication link latency we should expire this key on the slave on
-  access?