Feature/use api key

[josselinchevalay]

Hello,

i think it can be intresting use api key looks like : http://docs.grafana.org/http_api/auth/#create-api-token instead of user credentials.

Regards

[komarovd95]

@josselinchevalay Please, add description of apiKey property to README.md Anyway, thank you for your contribution

[codecov[bot]]

Codecov Report

Merging #1 into master will decrease coverage by 2.03%. The diff coverage is 50%.

@@             Coverage Diff              @@
##             master       #1      +/-   ##
============================================
- Coverage     82.85%   80.82%   -2.04%     
- Complexity       33       34       +1     
============================================
  Files             8        8              
  Lines           140      146       +6     
  Branches          5        5              
============================================
+ Hits            116      118       +2     
- Misses           19       22       +3     
- Partials          5        6       +1

Impacted Files	Coverage Δ	Complexity Δ
...lugins/grafana/dashboard/impl/DashboardSender.java	69.56% <50%> (-6.63%)	3 <1> (ø)
.../grafana/dashboard/impl/GrafanaUploadSettings.java	86.2% <50%> (-5.8%)	7 <1> (+1)

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