Added dictionary_spline.py
Preliminary version for dictionary_spline
Added trivial test for VectorSpline.
Added second testcase for VectorSpline.
Vector_Spline uses dummy interpolation for non-numeric types.
Added Dictionary_Spline tests to travis CI.
Added skipped and failing testcase for piececwise tuple interpolateion.
Vector spline recursion checkpoint.
One level recursion now functioning.
Updated recursion tests.
VectorSpline now calls VectorSpline instead of Univariate spline in recursive cases.
Added nested recursion testcase for VectorSpline.
Refactored VectorSpline tests to use list comprehension.
Merge pull request #8 from matthiasvegh/DictionarySpline

Dictionary spline