Updated datasets, cleaner imports

[pitkant]

• Fixes issue old-style CRS in spatial data. #237 by updating the old dataset with a more current one.
• Includes more comprehensive documentation about variables in included dataset and datasets downloaded from the Eurostat/GISCO service.
• dplyr and tidyr namespaces are no longer completely imported into the eurostat package, importFrom is used now instead

[codecov]

Codecov Report

Merging #239 (a866e98) into master (8d5adc9) will not change coverage.
The diff coverage is 100.00%.

❗ Current head a866e98 differs from pull request most recent head ea2eed2. Consider uploading reports for the commit ea2eed2 to get more accurate results

@@           Coverage Diff           @@
##           master     #239   +/-   ##
=======================================
  Coverage   68.12%   68.12%           
=======================================
  Files          22       22           
  Lines         756      756           
=======================================
  Hits          515      515           
  Misses        241      241           

Impacted Files	Coverage Δ
R/get_eurostat.R	72.34% <ø> (ø)
R/tidy_eurostat.R	68.85% <ø> (ø)
R/get_eurostat_geospatial.R	92.61% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8d5adc9...ea2eed2. Read the comment docs.