added NuGet 2.7
added NuGet 2.6
update UI to support 2.7's package restore command
support 2.7 commandline generation
rework NuGet installer/upgrade code to support restore command
Merge branch 'v0.9' into 2.7
run tests on 2.7
added 2.7 to c# part
include tests on 2.7 in .NET
add install mode into test
make tests include 2.7
add unit tests for restore/install commands
add integration tests for NuGet restore command
fix UI
support packages restore, TW-31251
Update README
Merge branch 'v0.9' into v0.10
Merge remote-tracking branch 'github/v0.10' into v0.10
Merge branch 'v0.9' into v0.10
'normalized version' field supported