Log Message:
Update ruby-rest-client to 1.7.3.

# 1.7.3

- Security: redact password in URI from logs (#349 / OSVDB-117461)
- Drop monkey patch on MIME::Types (added `type_for_extension` method, use
  the public interface instead.

# 1.7.2

- Ignore duplicate certificates in CA store on Windows

# 1.7.1

- Relax mime-types dependency to continue supporting mime-types 1.x series.
  There seem to be a large number of popular gems that have depended on
  mime-types '~> 1.16' until very recently.
- Improve urlencode performance
- Clean up a number of style points

# 1.7.0

- This release drops support for Ruby 1.8.7 and breaks compatibility in a few
  other relatively minor ways
- Upgrade to mime-types ~> 2.0
- Don't CGI.unescape cookie values sent to the server (issue #89)
- Add support for reading credentials from netrc
- Lots of SSL changes and enhancements: (#268)
  - Enable peer verification by default (setting `VERIFY_PEER` with OpenSSL)
  - By default, use the system default certificate store for SSL verification,
    even on Windows (this uses a separate Windows build that pulls in ffi)
  - Add support for SSL `ca_path`
  - Add support for SSL `cert_store`
  - Add support for SSL `verify_callback` (with some caveats for jruby, OS X, #277)
  - Add support for SSL ciphers, and choose secure ones by default
- Run tests under travis
- Several other bugfixes and test improvements
  - Convert Errno::ETIMEDOUT to RestClient::RequestTimeout
  - Handle more HTTP response codes from recent standards
  - Save raw responses to binary mode tempfile (#110)
  - Disable timeouts with :timeout => nil rather than :timeout => -1
  - Drop all Net::HTTP monkey patches

# 1.6.8

- The 1.6.x series will be the last to support Ruby 1.8.7
- Pin mime-types to < 2.0 to maintain Ruby 1.8.7 support
- Add Gemfile, AUTHORS, add license to gemspec
- Point homepage at https://github.com/rest-client/rest-client
- Clean up and fix various tests and ruby warnings
- Backport `ssl_verify_callback` functionality from 1.7.0