fix issue 1787
Fix eval usage in tests to conform with eval semantics
Small typo fixed
Fixed typo in word avarege in result message of --intrinsic-latency analyzer
Fix blocking operations from missing new lists

Behrad Zari discovered [1] and Josiah reported [2]: if you block
and wait for a list to exist, but the list creates from
a non-push command, the blocked client never gets notified.

This commit adds notification of blocked clients into
the DB layer and away from individual commands.

Lists can be created by [LR]PUSH, SORT..STORE, RENAME, MOVE,
and RESTORE.  Previously, blocked client notifications were
only triggered by [LR]PUSH.  Your client would never get
notified if a list were created by SORT..STORE or RENAME or
a RESTORE, etc.

Blocked client notification now happens in one unified place:
  - dbAdd() triggers notification when adding a list to the DB

Two new tests are added that fail prior to this commit.

All test pass.

Fixes #1668

[1]: https://groups.google.com/forum/#!topic/redis-db/k4oWfMkN1NU
[2]: #1668
Fix lack of SA_ONSTACK under Cygwin

Fixes #232
Fix lack of strtold under Cygwin

Renaming strtold to strtod then casting
the result is the standard way of dealing with
no strtold in Cygwin.
generate-command-help.rb updated with new hyperloglog group.
redis-cli help.h updated.
Missing return REDIS_ERR added to processMultibulkBuffer().

When we set a protocol error we should return with REDIS_ERR to let the
caller know it should stop processing the client.

Bug found in a code auditing related to issue #1699.
Fix null file pointer access
Check key expiration before deleting

Deleting an expired key should return 0, not success.

Fixes #1648
Add test for deleting an expired key

Verify proper expire-before-delete behavior.

This test passes with the expire-before-delete commit and fails
without it.
Scripting: simpler reply buffer creation in luaRedisGenericCommand().

It if faster to just create the string with a single sdsnewlen() call.
If c->bufpos is zero, the call will simply be like sdsemtpy().
Define HAVE_ATOMIC for clang.
Scripting: luaRedisGenericCommand() fast path for buffer-only replies.

When the reply is only contained in the client static output buffer, use
a fast path avoiding the dynamic allocation of an SDS string to
concatenate the client reply objects.
Scripting: replace tolower() with faster code in evalGenericCommand().

The function showed up consuming a non trivial amount of time in the
profiler output. After this change benchmarking gives a 6% speed
improvement that can be consistently measured.
Fixed missing c->bufpos reset in luaRedisGenericCommand().

Bug introduced when adding a fast path to avoid copying the reply buffer
for small replies that fit into the client static buffer.
Scripting: cache argv in luaRedisGenericCommand().

~ 4% consistently measured speed improvement.
Scripting: don't call lua_gc() after Lua script run.

Calling lua_gc() after every script execution is too expensive, and
apparently does not make the execution smoother: the same peak latency
was measured before and after the commit.

This change accounts for scripts execution speedup in the order of 10%.