Updated projects for VS2013 / ASP.NET MVC 5.
Updated Flot project to MVC 5.1 and AspNetMvc to 5.0. (MVC3 is not properly supported in VS2013)
Removed dependency to SQL Express
Updated NuGet to version 2.8.50320.36
Fixed ExponentiallyDecayingSample by using nano-seconds ticks as in the Java verion, instead of either the Stopwatch ticks or datetime ticks.

Conflicts:
	src/metrics/Core/MeterMetric.cs
Fixed the ExponentiallyDecayingSample; replaced the ConcurrentDictionary used before by a SortedDictionary, which is required to get the sample items ordered by keys, as required by the algorithm.
The value of Alpha required the time to be measured in Seconds, not Ticks or nanoseconds; that's now fixed.

Conflicts:
	src/metrics/metrics.csproj