Upgrade projects to VS 2013.
Add NSass/libsass as a processor for SASS:
  Remove SassProcessor from Global.asax because it makes testing the
  NSassProcessor impossible.
  AutoBundling tests for SASS are broken because the handler is no longer
  registered - will need to work this out with Alex Cuse.
force inclusion of nsasstest.scss (blocked by .gitignore previously)
add nuspec and attempt to add .cs.pp file for NSass preprocessor
include IgnoreExtensions on IPreprocessor interface (#279)
update nuspec to 0.9.5.1-beta4 (#279)
add naive way to get direct access to bundle content (#282)
- only minify if asset is marked for minification AND debugging not
  enabled
- using empty string as output file path - may lead to rewriting issues.
  Will await community feedback about how to handle this, gut feeling is
  that relative paths should not be used in this situation.
update nuspect to 0.9.5.1-beta5
undo upgrade to vs2013
try to keep up with xml comments
add bundle state caching for raw content (#282)
throw exception if cached raw-content bundle state not found
fix bad rewrite path passed to .ProcessCssFile when processing imports
(#277)
give instance-configured preprocessors precedence over global (#281)
update nuspect to 0.9.5.1-beta6
add simple script to hide all packages for a version on NuGet
cleanup areas where globally configured hasher was not used
update nuspec to 0.9.5.1-beta7
include NSass project in mono solution