Remove unnecessary dependency Cecil.FlowAnalysis.dll

Code compiles without it; having the dependency causes problems with
Gendarme because on Linux Mono.Cecil.dll gets copied to output
directory causing Gendarme not to be able to find several dlls
it needs.

Change-Id: I970cfcb28276efffa6a7cb184966dea4a45ec2fd
Remove obsolete NAnt directory

Change-Id: Iedee9feb2a688bb812cf76a98985546b122b8d80