CP-4823: Exposed http calls in the Powershell SDK; also added an example script.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>
Added version file. Capitalised changelog file name to conform with the readme,
contrib, version and license files. Bumped version and updated changelog.

Signed-off-by: Konstantina Chremmou <konstantina.chremmou@citrix.com>
Merge pull request #6 from kc284/master

CP-4823: Exposed http calls in the Powershell SDK; also added an example...