huge commit

- worked on about everything
- grid walker using plugable modules
- wifi models
- new distributions
- worked on geometric data-structures
- added typesafe timestamps
- worked on grid-building
- added sensor-classes
- added sensor analysis (step-detection, turn-detection)
- offline data reader
- many test-cases

math/distribution/Normal.h

@@ -4,6 +4,7 @@
 #include <cmath>
 #include <random>
 #include "../Random.h"
+#include "../../Assertions.h"
 
 namespace Distribution {
 
@@ -46,6 +47,7 @@ namespace Distribution {
 
 		/** get the probability for the given value */
 		static T getProbability(const T mu, const T sigma, const T val) {
+			Assert::isTrue(sigma > 0, "sigma must be >= 0");
 			const T a = 1.0 / (sigma * std::sqrt(2.0 * M_PI));
 			const T b = -0.5 * ((val-mu)/sigma) * ((val-mu)/sigma);
 			return a * std::exp(b);