Added pause and unpause build configuration

Integration tests included
Merge pull request #59 from ericdc1/master

Added pause and unpause build configuration
Change content type from application/xml to text/plain when creating projects

As per the TeamCity REST API documentation, to create a project you
need to POST the plain text name, so the content type needs to be
"text/plain" and not "application/xml".
Added test for project creation
The "accept" header needs to be specified so we get application/json and not application/xml in return
Merge pull request #72 from okb/create-project

Change content type from application/xml to text/plain when creating projects
BugFix

Make it possible to download artifacts, which include a "+" within the url
Merge pull request #74 from SCTHO/master

BugFix
Implement statistics for builds

Allows retrieval of properties such as no. of passed tests in a given
build. From
http://confluence.jetbrains.com/display/TCD8/REST+API#RESTAPI-Statistics
Merge remote-tracking branch 'remotes/upstream/pr/82'

Conflicts:
	src/TeamCitySharp/ActionTypes/IBuildConfigs.cs
	src/TeamCitySharp/ActionTypes/Projects.cs
	src/TeamCitySharp/TeamCitySharp.csproj