Add JSON reporter

Changes:

• Add json-reporter that outputs progress and result info in JSON format
• Move fail options from default reporter into main lobo options

Prompt accept default

Changes:

• Allows use of return/enter key to select default value when waiting for user response

Update to elm-test v4

Changes:

• Add support for elm-test todo
• Add support for elm-test skip
• Add support for elm-test only
• Update to latest elm-test-extra, including rename of focus -> only to be inline with elm-test
• Improve support for fail on incomplete run (--failOnOnly, --failOnSkip, --failOnTodo)

Improve offline testing

Changes:

• Adds --noInstall option for running lobo offline