Every function inside sds.c is now commented.
Inline protocol improved to accept quoted strings.
sdsrange() does not need to return a value.

Actaully the string is modified in-place and a reallocation is never
needed, so there is no need to return the new sds string pointer as
return value of the function, that is now just "void".
Ignore sdsrange return value.
Use latest sds.c in the hiredis library under deps.
Merge remote-tracking branch 'antirez/unstable' into unstable