More fixes for ambiguous function overloads in VB

Fixes more issues raised in #31
Ensure that wcfContext.InstanceContext is not null
Avoid potential null reference
Small code changes
Implementation of StepIf (#34)
CustomTimingIf implementation (#34)
New nuget versions
Update Sample.Mvc to show usage of StepIf

Include StepIf and CustomTimingIf in Sample.MVC HomeController. Related
to #34.
Swallow harmless EF6 exception during Initialize

Try to prevent tripping harmless Exception when initializing the DB.
Issue in EF6 upgraded from EF5 on first db call in debug mode:
http://entityframework.codeplex.com/workitem/594.

Fix for issue reported in [on the community
site](http://community.miniprofiler.com/t/support-for-ef6/4/7?u=yaakov_ellis)
Make the minSaveMs param optional in CustomTiming constructor
Merge pull request #37 from kosmakoff/master

Initial Work on StackExchange.Profiling.MongoDB
Remove unneeded model from Sample.Mongo
Restore jquery 1.5.1 package
Sample.Console: add some simple multi-threaded stepping to illustrate issues with current implementation
Add more info to ReadMe
Add SqlLite package to Sample.Wcf
Add missing packages/*/nuspec files
Merge branch 'master' of https://github.com/kosmakoff/MiniProfiler-dotnet into kosmakoff-master
Merge pull request #40 from MiniProfiler/kosmakoff-master

Fix MongoDB profiling Merge
Add EF6 ReadMe