add tests
add NA support for boolean vectors
fixes #31
Merge pull request #51 from SwedishPensionsAgency/issue-31

Issue 31
fix some check warnings/notes
fix some check warnings/notes
fix issue #19 and #48
Merge pull request #53 from SwedishPensionsAgency/issue-19

fix issue #19 and #48
update help files
add read_only (and update escape char)
Merge pull request #54 from SwedishPensionsAgency/issue-35

add read_only (and update escape char)
resolve merge conflict
documentation files: yaml -> json
yaml -> json
update toJSON arguments