TIP: Using VS2015? I've got you covered!
So, if you download the extension from Visual Studio Gallery (here) you’ll find it won’t install into VS 2013, but it’s easy to fix.
Open up your downloaded file using your preferred zip solution (7zip in my case), edit the extension.vsixmanifest file, and change the following lines from:
<Installation InstalledByMsi="false" AllUsers="true">
<InstallationTarget Version="11.0" Id="Microsoft.VisualStudio.Pro" />
<InstallationTarget Version="11.0" Id="Microsoft.VisualStudio.Premium" />
<InstallationTarget Version="11.0" Id="Microsoft.VisualStudio.Ultimate" />
</Installation>
to:
<Installation InstalledByMsi="false" AllUsers="true">
<InstallationTarget Version="12.0" Id="Microsoft.VisualStudio.Pro" />
<InstallationTarget Version="12.0" Id="Microsoft.VisualStudio.Premium" />
<InstallationTarget Version="12.0" Id="Microsoft.VisualStudio.Ultimate" />
</Installation>
Save the file and make sure the archive is updated. Then double click and install the extension.