Create/update blips for hal-hateoas, microservices and spring-boot

radar/2017-10-01/hal-hateoas.md

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+---
+title:      "HAL / HATEOAS"
+ring:       trial
+quadrant:   methods-and-patterns
+
+---
+We still recommend the usage of HAL and HATEOAS.
+ 
+But depending on the resource structure, there are some pitfalls to be aware of:
+- Increased amount of HTTP calls
+- Parallelization of client side calls is more difficult or even impossible when following links on heavily nested resource structures
+- Consumer side code might get larger