Added the GetMemberActivity api method to the MailChimp Manager class

This executes the api method "lists/member-activity" which get the most recent 100 activities for particular list members.
Merge pull request #36 from AndrewKoransky/master

TemplateInformationResult adjustments
Merge pull request #37 from AndrewKoransky/master

campaign adjustments - optional helper functions, optional exception handling change
Added static segment detail to lists/member-info responses
Moved StaticSegment.cs where it belongs in the project file
Merge pull request #39 from lfagan/master

Added static segment detail to list/member-info responses
Campaign Update method
Test for UpdateCampaign method
Merge pull request #41 from dazaris/master

Added GetMemberActivity and UpdateCampaign methods and tests
Updated README

Updated status with new numbers
Added last 'User' methods and unit tests
Updated README

Updated status
Added Interest Grouping / Group Calls
Merge pull request #42 from leowin/master

Added Interest Grouping / Group Calls
Updated README

Updated status counts
Updated README.md

Updated Quickstart to clarify and improved formatting
Rearranging & starting on campaign ready check
Moved test API key to configuration setting
Overhauled mergevars.  Fixed #46, #25, #5

Mergevars are now handled as an object when passing as a parameter, and
as a Dictionary<string, string> when getting data back.
Updated ServiceStack.Text package reference