Merge pull request #284 from jkodroff/master

Remove and re-add the NSass project, update MVC Tests project to be VS20...
add category to ignore NSass tests on buildserver
always use high trust when testing globally configured hasher use
enable configuring custom temp path providers (fix #272)
include a SHA1 hasher (uses default implementation on system) and configuration option for FIPS environments (fix #270)
always use SHA1CNG for hashing (don't want non-FIPS compliant SHA1Managed to be chosen as default for some reason)
update nuspect to 0.9.5.1
update NSass package description