SPDY: add SPDY/3 documentation
Merge pull request #379 from chobits/spdy_v3_doc

SPDY: add SPDY/3 documentation
Added image_filter_crop_offset
docs for "limit upstream tries"
Merge pull request #391 from cfsego/docs

pull request for limiting upstream tries
fix bug described in issue 384, which is about persistent connection in upstream_check_module
Merge pull request #392 from lilbedwin/upstream_check2

fix bug described in issue 384, which is about persistent connection in ...
Auto read nameserver from /etc/resolv.conf.
Merge pull request #390 from lifeibo/resolver

Auto read nameserver from /etc/resolv.conf.
https://github.com/alibaba/tengine/issues/368
Merge pull request #395 from taoyuanyuan/trim

trim module feature and bugfix (https://github.com/alibaba/tengine/issues/368)
improve the document of upstream check module
Merge pull request #396 from lilbedwin/upstream_check_doc

improve the document of upstream check module
"HEAD" method is recommended in upstream check module
Merge pull request #397 from lilbedwin/upstream_check_doc

"HEAD" method is recommended in upstream check module
Merge pull request #380 from Lax/feature/image_filter_crop_offset

Added image_filter_crop_offset
Striped the last linefeed in the resolver file

In CentOS 6.4, the interface gethostbyname can't parse the
nameserver string with extra linefeed.
Merge pull request #400 from yaoweibin/fix_resolver_linefeed

Striped the last linefeed in the resolver file
merge changes between nginx 1.4.4 and 1.4.5

 Details are as following:

 *) Bugfix: the $ssl_session_id variable contained full session
    serialized instead of just a session id.
    Thanks to Ivan Ristić.

    Changeset: http://hg.nginx.org/nginx/rev/70f4d99ded41

 *) Bugfix: client connections might be immediately closed if deferred
    accept was used; the bug had appeared in 1.3.15.

    Changeset: http://hg.nginx.org/nginx/rev/462ae7eedc68

 *) Bugfix: alerts "zero size buf in output" might appear in logs while
    proxying; the bug had appeared in 1.3.9.

    Changeset:  http://hg.nginx.org/nginx/rev/3b7463b08747

 *) Bugfix: a segmentation fault might occur in a worker process if the
    ngx_http_spdy_module was used.

    Changeset: http://hg.nginx.org/nginx/rev/b8e6297358b5

 *) Bugfix: proxied WebSocket connections might hang right after
    handshake if the select, poll, or /dev/poll methods were used.

    Changeset: http://hg.nginx.org/nginx/rev/560de9681661

    More details are available here:
    http://mailman.nginx.org/pipermail/nginx/2014-January/041839.html

 *) Bugfix: a timeout might occur while reading client request body in an
    SSL connection using chunked transfer encoding.

    Changeset: http://hg.nginx.org/nginx/rev/35b00bcf72fe

    More details are available here:
    http://mailman.nginx.org/pipermail/nginx/2013-November/041178.html

 *) Bugfix: memory leak in nginx/Windows.

    Changeset: http://hg.nginx.org/nginx/rev/fd77e2018652

    Note that this patch is not merged because tengine does not support win32.
Added ascii code variable supported