first pass at adding distributed file logger support

made the logger stringification common.
tweak the distributed logger string generation some

tested via my own test fsx
semicolon delimiters for msbuild distributed logger parameters
Don't fail on nuget path scanning - references #537
Bump version to 3.4.1
Cheating for Alex
Bump version to 3.4.2
Cheating for Alex
Bump version to 3.4.3
Merge branch 'master' of https://github.com/fsharp/FAKE

Conflicts:
	src/app/FAKE/AssemblyInfo.fs
	src/app/Fake.Deploy.Lib/AssemblyInfo.fs
	src/app/Fake.Deploy/AssemblyInfo.fs
	src/app/Fake.Experimental/AssemblyInfo.fs
	src/app/Fake.SQL/AssemblyInfo.fs
	src/app/FakeLib/AssemblyInfo.fs
	src/deploy.web/Fake.Deploy.Web/AssemblyInfo.fs
Issue #541: look first in default path for a tool, and only if it was not found there start the search from the root.
Merge pull request #542 from Slesa/develop

Issue #541: look first in default path for a tool
Merge pull request #535 from Bomret/feature/signtoolhelper

Added new SignToolHelper
Merge pull request #536 from baronfel/msbuild_dlogger

Add support for MSBuild Distributed Loggers
Merge branch 'develop' of https://github.com/fsharp/FAKE

Conflicts:
	src/app/FakeLib/Globbing/FileSystem.fs
Bump version to 3.5.0
Bump version to 3.5.1
Fixing build
Make GetPackageVersion work with Paket
UnionArgParser fixed