Allow the user to disable SSL peer verification.

This works with commits to the em-winrm gem and knife-windows.
Update README.md

In case of Linux/Windows pair with SSL, had to manually specify certificate, and dig through transport.rb to find out how to do it
Loosen the dependency on the logger gem

Removes dependency conflicts in applications that require
later 1.x-series versions.

 '~> 1.6':    don't accidentally select 2.x
 '>= 1.6.1':  stay above the previous minimum
Relax dependency on httpclient

Removes dependency conflicts in applications that require
later 2.x-series versions.

 '~> 2.2':    don't accidentally select 3.x
 '>= 2.2.0.2':  stay above the previous minimum
Relax dependency on Nokogiri

Removes dependency conflicts in applications that require
later 1.x-series versions.

 '~> 1.5':    don't accidentally select 2.x
Merge pull request #50 from yaauie/loosen-nokogiri-dependency

Relax dependency on Nokogiri
Merge #49
Merge pull request #48 from yaauie/loosen-logging-depenency

Loosen the dependency on the logger gem
Merge pull request #47 from jujav4ik/patch-1

Update README.md
Bump for release
Merge branch 'master' of github.com:WinRb/WinRM
Merge pull request #44 from gswallow/master

Allow user to disable SSL peer ceritifcate validation
Create changelog.md