Add support for custom CURL options

Add support for adding custom CURL options, e.g. $facebook->setCurlOptions(array(CURLOPT_SSLVERSION => 3)).

It seems that most Facebook servers hang with new openssl library where TLS 1.2 is default, and this is solution which covers possible future problems. Quick fix would be adding  "CURLOPT_SSLVERSION => 3" to $CURL_OPTS.

SSL/TLS problems are related to this bugs:
http://rt.openssl.org/Ticket/Display.html?id=2771
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=665452
https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/965371

This one hangs (no response from server):

$ openssl s_client -msg -host 69.171.229.25 -port 443
CONNECTED(00000003)
>>> TLS 1.2  [length 013b]
    01 00 01 37 03 03 4f 7d 41 e2 8a 8d 37 85 cb 62
    85 6d e1 f3 82 34 a4 8d 42 96 73 3d 4b 2f e1 fc
    cd 56 17 be fc b1 00 00 9e c0 30 c0 2c c0 28 c0
    24 c0 14 c0 0a c0 22 c0 21 00 a3 00 9f 00 6b 00
    6a 00 39 00 38 00 88 00 87 c0 32 c0 2e c0 2a c0
    26 c0 0f c0 05 00 9d 00 3d 00 35 00 84 c0 12 c0
    08 c0 1c c0 1b 00 16 00 13 c0 0d c0 03 00 0a c0
    2f c0 2b c0 27 c0 23 c0 13 c0 09 c0 1f c0 1e 00
    a2 00 9e 00 67 00 40 00 33 00 32 00 9a 00 99 00
    45 00 44 c0 31 c0 2d c0 29 c0 25 c0 0e c0 04 00
    9c 00 3c 00 2f 00 96 00 41 c0 11 c0 07 c0 0c c0
    02 00 05 00 04 00 15 00 12 00 09 00 14 00 11 00
    08 00 06 00 03 00 ff 02 01 00 00 6f 00 0b 00 04
    03 00 01 02 00 0a 00 34 00 32 00 0e 00 0d 00 19
    00 0b 00 0c 00 18 00 09 00 0a 00 16 00 17 00 08
    00 06 00 07 00 14 00 15 00 04 00 05 00 12 00 13
    00 01 00 02 00 03 00 0f 00 10 00 11 00 23 00 00
    00 0d 00 22 00 20 06 01 06 02 06 03 05 01 05 02
    05 03 04 01 04 02 04 03 03 01 03 02 03 03 02 01
    02 02 02 03 01 01 00 0f 00 01 01


This one works (supports TLS 1.2):

$ openssl s_client  -msg -host 69.171.234.18 -port 443
CONNECTED(00000003)
>>> TLS 1.2  [length 013b]
    01 00 01 37 03 03 4f 7d 45 5a 87 36 98 cb 4f 30
    48 64 5c 0d a8 56 b6 4c 58 d8 73 66 96 0d c6 67
    68 c6 17 82 ad c7 00 00 9e c0 30 c0 2c c0 28 c0
    24 c0 14 c0 0a c0 22 c0 21 00 a3 00 9f 00 6b 00
    6a 00 39 00 38 00 88 00 87 c0 32 c0 2e c0 2a c0
    26 c0 0f c0 05 00 9d 00 3d 00 35 00 84 c0 12 c0
    08 c0 1c c0 1b 00 16 00 13 c0 0d c0 03 00 0a c0
    2f c0 2b c0 27 c0 23 c0 13 c0 09 c0 1f c0 1e 00
    a2 00 9e 00 67 00 40 00 33 00 32 00 9a 00 99 00
    45 00 44 c0 31 c0 2d c0 29 c0 25 c0 0e c0 04 00
    9c 00 3c 00 2f 00 96 00 41 c0 11 c0 07 c0 0c c0
    02 00 05 00 04 00 15 00 12 00 09 00 14 00 11 00
    08 00 06 00 03 00 ff 02 01 00 00 6f 00 0b 00 04
    03 00 01 02 00 0a 00 34 00 32 00 0e 00 0d 00 19
    00 0b 00 0c 00 18 00 09 00 0a 00 16 00 17 00 08
    00 06 00 07 00 14 00 15 00 04 00 05 00 12 00 13
    00 01 00 02 00 03 00 0f 00 10 00 11 00 23 00 00
    00 0d 00 22 00 20 06 01 06 02 06 03 05 01 05 02
    05 03 04 01 04 02 04 03 03 01 03 02 03 03 02 01
    02 02 02 03 01 01 00 0f 00 01 01
<<< TLS 1.2  [length 0051]
    02 00 00 4d 03 03 8a 1a 5a f5 d4 46 82 16 af c4
    80 6a 78 88 e3 36 00 96 22 a9 2b 5f a8 9d 69 f6
    43 04 49 46 37 44 20 1c 9e 2a 06 c2 6e b2 91 c1
    dc 74 5a 40 e4 74 3e d4 e3 c2 bd 16 90 27 6a 2b
    64 c8 2e 65 cc 11 07 00 04 00 00 05 ff 01 00 01
    00