Performance improvements EncryptionMessageMutator

Performance improvements for IsSystemType and reflection for
EncryptionMessageMutator
Fixed naming of cache
Fixed the problem: when FRM attribute was present, instead of adding a commented out section for the AuditConfig, a section element was added, resulting in startup error.
Removing the setup files since there is a new repo for them
Disabled a unstable test until we can find the root cause
http://builds.particular.net/viewLog.html?buildId=24968&tab=buildResultsDiv&buildTypeId=NServiceBusCore_Build#testNameId3699571671064821291
Added nuspec for tools nuget
fix build release configuration update
Added missing T4Scaffolding.Core nuget dep to host package.
Added src to package
move to versioning before build

fixes #1639
add missing file
fix #1635
Changed the DefaultFloatConstraint to Current
Updating ripple to suport codeonly packages
Updated readme with up to date build instructions
Removed buid.bat
Updated returntosourcequeue to look at the new v4 headers, closes #1640
try ref log for versioing
Made Gateway legacy mode "ON" by default, fixes #1641
Making sure that legacy mode is defaulted to on even when doing code only
routing
Closes #1641