Log Message:
Update ruby-mechanize to 2.5.1.

=== 2.5.1

* Bug fix
  * Mechanize no longer copies POST requests during a redirect which was
    introduced by #215.  Pull request #229 by Godfrey Chan.

=== 2.5

* Minor enhancement
  * Added Mechanize#ignore_bad_chunking for working around servers that don't
    terminate chunked transfer-encoding properly.  Enabling this may cause
    data loss.  Issue #116
  * Removed content-type check from Mechanize::Page allowing forced parsing
    of incorrect or missing content-types.  Issue #221 by GarthSnyder
* Bug fixes
  * Fixed typos in EXAMPLES and GUIDES.  Pull Request #213 by Erkan Yilmaz.
  * Fixed handling of a quoted content-disposition size.  Pull Request #220 by
    Jason Rust
  * Mechanize now ignores a missing gzip footer like browsers do.  Issue #224
    by afhbl
  * Mechanize handles saving of files with the same name better now.  Pull
    Request #223 by Godfrey Chan, Issue #219 by Jon Hart
  * Mechanize now sends headers across redirects.  Issue #215 by Chris Gahan
  * Mechanize now raises Mechanize::ResponseReadError when the server does not
    terminate chunked transfer-encoding properly.  Issue #116
  * Mechanize no longer raises an exception when multiple identical
    radiobuttons are checked.  Issue #214 by Matthias Guenther
  * Fixed documentation for pre_connect_hooks and post_connect_hooks.  Issue
    #226 by Robert Poor
  * Worked around ruby 1.8 run with -Ku and ISO-8859-1 encoded characters in
    URIs.  Issue #228 by Stanislav O.Pogrebnyak