links instead hrefs

[jkralik]

new API allows to avoid call of multicast for update/retrieve resource.
retrieve links is possible any time by calling GetResourceLinks

[codecov-io]

Codecov Report

Merging #32 into master will decrease coverage by 0.83%.
The diff coverage is 62.06%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   53.25%   52.42%   -0.84%     
==========================================
  Files          18       18              
  Lines        1091     1011      -80     
==========================================
- Hits          581      530      -51     
+ Misses        417      391      -26     
+ Partials       93       90       -3

Impacted Files	Coverage Δ
local/client.go	50% <ø> (-3.94%)	⬇️
local/observeResource.go	4.87% <0%> (ø)	⬆️
local/device.go	73.95% <100%> (+0.81%)	⬆️
local/isSecured.go	71.42% <100%> (ø)	⬆️
local/getResourceLinks.go	56.25% <36.36%> (-19.29%)	⬇️
local/getResource.go	30.43% <37.5%> (+7.93%)	⬆️
local/disownDevice.go	52.38% <50%> (-3.18%)	⬇️
local/getDevice.go	62.5% <60%> (+0.59%)	⬆️
local/getDevices.go	63.33% <60%> (+1.17%)	⬆️
local/provisionDevice.go	69.23% <60.6%> (-1.83%)	⬇️
... and 5 more

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