Added some tests to check for SDK's before building
Fixed issue with build script
removed call to installer as that will be a seperate task
Added missing content type writer source files.
Merge branch 'develop3d' of https://github.com/mono/MonoGame into pipeline
Merge pull request #1279 from slygamer/pipeline

Added missing content type writer source files.
Merge pull request #9 from mono/develop3d

Merge back from develop3d