Resolve "Terms constants"

Closes #27

See merge request genesys-pgr/glis-client!17

Resolve "Updating target in GLIS"

Closes #23

See merge request genesys-pgr/glis-client!15

Resolve "JSON-only client"

Closes #24

See merge request genesys-pgr/glis-client!16

- Uses GLIS_USERNAME, GLIS_PASSWORD env vars for authentication against production
- Uses GLISTEST_USERNAME, GLISTEST_PASSWORD env vars for test
- GLIS_DEBUG env var sets API client to debug mode

Swagger XML

Closes #4, #19, #15, #9, #20, and #22

See merge request !14

Resolve "DOI holder bulk check"

Closes #21

See merge request !13

Resolve "Documentation"

Closes #3

See merge request !11

Resolve "Fix terms call documentation"

Closes #18

See merge request !10

Resolve "Generate .Net code"

Closes #10

See merge request !9

Resolve "Modules with different implementations"

Closes #8

See merge request !8

Resolve "Documentation"

Closes #3

See merge request !6

Resolve "Swagger for other platforms"

Closes #7

See merge request !5