PUBLISHED_FROM=7864ffa26cb553f5d4a93248f67c288327ec23b0

Optional specification of SSL/TLS cipher suites.

PUBLISHED_FROM=e8968c6c7a92f10514d3ee575c2fb9be862e6cf8

Also fixed a memory leak on reconnect: previously, each reconnect was
creating a `struct mg_connection` which was never reclaimed

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PUBLISHED_FROM=0454cdeec5c7120eb4bf905fdd5b7abdcb4003c2

Currently only OpenSSL API impl, but the plan is to add more.

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PUBLISHED_FROM=73ef8ae768585d3c204e6e022848f49e8f4a8de2

Disable sync resolver by default.

PUBLISHED_FROM=dbaed194e5fe211c07564fe6880649a1aee7f662

Possible values:
  MG_NET_IF_SOCKET (1) - traditional BSD socket API
  MG_NET_IF_SIMPLELINK (2) - TI's SimpleLink socket interface
  MG_NET_IF_LWIP_LOW_LEVEL - a net_if implementation that uses LWIP's
    low-level API, when LWIP_SOCKET is not available.

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PUBLISHED_FROM=9fd0cebfa8df53b5d9574a8d013305ddda5e7a18

"#if FOO" still works with simple -DFOO, but gives more flexibility.
Specifically, if user expressed no preference (FOO is not defined),
we can apply reasonable defaults (this is the legitimate use of ifdef).

In short, from now on, please use

 #if MG_ENABLE_FOO

instead of

 #ifdef MG_ENABLE_FOO

Since we are all used to #ifdef, this change also adds a precommit check
to police this. Specifically, in *.h and *.c files that are Copyright Cesanta,
"ifdef" and "if defined()" are not allowed to be used with macros that contain
ENABLE or DISABLE, unless the like also contains "ifdef-ok".

Hence, if you are sure you want to use ifdef, use this:

 #ifdef MG_ENABLE_FOO /* ifdef-ok */

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PUBLISHED_FROM=293a54ab09e6879b6f0c36975a137eeaeff92098

On my way, fixed a couple of cases where we had `()` in the header, and
non-empty argument list in the source file.

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