#48 - Add release notes to Femah.Core NuGet package when publishing.

- Defaulted '-configMode' in build scripts to 'Release'
- Modified how psake module is loaded as I have a feeling it is causing TeamCity to trip up in the Publish-Femah build with the error "Import-Module : The specified module '.\lib\psake.4.3.1.0\tools\psake.psm1' [00:59:02]was not loaded because no valid module file was found in any module directory."