Issue 179 fixed, now redis-cli is able to parse correctly multi bulk replies with elements that are errors

The pid file is now created only after the server is correctly initialied. It is also removed on sigterm and when the stack trace is produced after a sigbus or a sigsegv. This two changes should fix the Issue 175

slave with attached slaves now close the conection to all the slaves when the connection to the master is lost. Now a slave without a connected link to the master will refuse SYNC from other slaves. Enhanced the replication error reporting. All this will fix Issue 156

Fixed overflow detection in argument to long convertion function in general, and in expire/ttl pairs specifically, addressing issue 54

the commands are read from stdin.

Minor change in redis-cli output for the (multi-)bulk response but this
will be fixed in the next commit.

Patched redis-cli to abort on unexpected quotation. This caused
redis-cli to get into an infinite, memory-consuming loop.

Changed redis-cli to output the raw response for a bulk reply when it is
run in interactive mode instead of checking isatty.

support for write operations against expiring keys, by master-controlled expiring in replication and AOF synthesizing DEL operations

Return an error when the resulting value is not a number (NaN). Fix
ZUNIONSTORE/ZINTERSTORE to clean up when a weight argument is not a
double value.

When +inf and -inf are added, the result is NaN. We don't want NaN
scores in a sorted set, so agreed on the result of this operation being
zero.

even when the list is swapped out and in again.

In order to trigger the bug what's needed is to call ZINTERSTORE
resulting into an empty set created, bug against a key that already
existed. The command was not propagated, so the replica ended with the
key that the master removed. Sequence of command to reproduce:

redis-cli hset 446 34 905
redis-cli hset 446 393 911
redis-cli zadd 966 0.085412045980529885 652
redis-cli zadd 645 0.25081839284432045 280
redis-cli zinterstore 446 2 966 645

better random dataset creation function in test. master-slave replication test now is able to save the two datasets in CSV when an inconsistency is detected.