Merge pull request #1 from pawelpabich/master

Added OctopusOutputDirectory so the output can be specified by the app
Updated targets to better resolve NuGet.exe dependency and to make sure the output directory exists
Added Remove-Import cmdlet.
Refactored Install.ps1 to support NuGet package restore.
Added Get-SolutionDir to MSBuild.ps1
Added support for using NuGet Package Restore with projects that use OctoPack.
Merge pull request #4 from jeff-french/master

Add support for NuGet Package Restore.
Searching .nuget directory for nuget.exe
Fixed bug in search paths
Embedded NuGet.exe and solve path resolution
Better TFS support
Updated OctoPack paths
Fix OctoPack for console/service apps
Fix upgrade logic for OctoPack with restore
Added a readme
Version number comes from target assembly
Update master
Properly recognising release builds
Added the ability to optionally publish packages
Added license