In the SQL Server install folder there is an executable called rs.exe. You can use this, passing it an .RSS file that contains the configuration that you want to deploy. You can then bulk deploy from your folder to Reporting Services.
If you have the source .rdl files in TFS you can use Team Build to process and create the .RSS and likely a zip package. You can then have it deployed by Release Management for Visual Studio 2013 through a specified release pipeline that pushed it from Dev->QA->Prod.
You can get information on how from Professional Application Lifecycle Management with Visual Studio 2013.