Initial generation of AssemblyInfo.g.cs file
Refactored solution structure for better maintainability

Previously, we had tasks and tests in a single project. By splitting those, we can eventually refactor our T4 codegen for code tasks to automatically include every task in the current project, since they would be all tasks.
Skip assembly info generation from build.proj script
Add missing AssemblyInfo.cs for Tasks project.
Update release notes for upcoming 0.2.8 release
Added missing v0.2.8 change log notes.