eol traitbank updated to reflect current API results

[dschlaep]

• addresses issue traitbank() not working for me #79

• function trait_bank:

  • checks for correct structure of returned object
  • prints message if structure mismatches expectation
  • always returns same object structure (potentially with empty
    elements)

• unit tests:

  • function check_traitbank
  • file 'test-traitbank.R'

• this pull-request passes unit tests and is installable:

devtools::test()

Loading traits
Testing traits
BETYdb tests: ....................
eol's traitbank tests: .....................

DONE ============================================

devtools::install()

Installing traits
[...]

• installing source package ‘traits’ ...
  ** R
  ** data
  *** moving datasets to lazyload DB
  ** inst
  ** tests
  ** preparing package for lazy loading
  ** help
  *** installing help indices
  ** building package indices
  ** installing vignettes
  ** testing if installed package can be loaded
• DONE (traits)
  Reloading installed traits

[codecov-io]

Current coverage is 10.58% (diff: 0.00%)

Merging #80 into master will increase coverage by 0.77%

@@            master        #80   diff @@
=========================================
  Files           14         14          
  Lines          683        680     -3   
  Methods          0          0          
  Messages         0          0          
  Branches         0          0          
=========================================
+ Hits            67         72     +5   
+ Misses         616        608     -8   
  Partials         0          0          

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[sckott]

thanks for the PR @dschlaep having a look

[sckott]

thanks, LGTM !