Modified build to use .Net 4.5.1 and modified setup to check for
.Net 4.5+ before install occurs. Only check for .Net 4.5 rather
than 4.5.1 because the only difference between the two versions in
the registry is an actual text value, not just whether a value is
defined. This may lead to problems; if it does, this will be addressed
then.
Merge branch 'master' into v1.4