refactoring. remove global state, use new logging, config functions

pixelapi/pixelapi.go

@@ -0,0 +1,9 @@
+package pixelapi
+
+type PixelAPI struct {
+	apiEndpoint string
+}
+
+func New(apiEndpoint string) *PixelAPI {
+	return &PixelAPI{apiEndpoint}
+}