Changed default version to be 99.99, so that the dev branch is always ahead of releases.
Squashed 'External/BuildScripts/' changes from ce4287c..22f5cdf

22f5cdf added a SetNuspecVersion target to update nuspec files with the correct version number.
d0862ee Changed PrintVersion to only print the Version property.
061c642 Changed Version.targets to use 99.99 as the default tag.

git-subtree-dir: External/BuildScripts
git-subtree-split: 22f5cdf9edd8d70d2422dac404bc8998edaf13c0
Merge commit '739c265e9fe75cf216c3433aa18dd776085c9907'
Added nuspec files for a number of projects and build targets to SrcML.NET.proj.