Fix for a race in BGSAVE that may result in some data not being saved as soon as possible (when the configured saving triggers should fire). Also known as Issue 313, more details there in the google code issue.

Fixed segfault in freeMemoryIfNeeded due to the fact that keys are now sds strings and not objects in the main hash table, thanks to Anthony Lauzon for spotting the bug and providing a patch.

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.