TS-2563: always set the SSL default verify paths

When working at reverse proxy mode with the following remap rule:

map https://xxx1.com https://xxx2.com
ssl.client.verify.server=1

If xxx2.com is providing trusted certificate and
'ssl.client.CA.cert.filename' is NULL, ats should be able to verify
the certificate in terms of the default provided CAs.
Update records.config.en.rst

Fix the default value for proxy.config.http.transaction_active_timeout_in

This closes #48.
TS-2319] Change default behavior for the various ignore-mismatch configs
TS-612: add support for SSL keys with passphrases

Add support for dialog settings in ssl_multicert.config to allow for
passphrase protected private keys.
TS-2531: add a nohost_rule check for proxy request
TS-2405 Change the default for proxy.config.net.sock_option_flag_out to
1, which enables TCP_NODELAY.

Authors: bcall, leif, xiongzongtao
TS-612: build fix for uninitialized variable
Add new secure link example plugin

Add an example plugin demonstrating one method of authorizing URL
access based on a shared secret.

This closes #27.
TS-2542 Turn on caching zero length responses by default
Fix unused variable warnings in secure-link example
TS-2210: add a plugin API to manipulate the session's SSL context
TS-2586 Improvements to the internal implementation of overridable
configuration lookups (_conf_to_memberp() ).

Review: Leif
update INSTALL file
Doc: Generate *.po files for Japanese translations
Doc: Translate admin/index
Doc: Translate admin/getting-started
Doc: Translate reference/plugins/index
Doc: Translate reference/configuration/remap.config
Doc: Translate reference/configuration/index
Doc: Translate admin/reverse-proxy-http-redirects