bump(globalconf): Add github.com/rakyll/globalconf dep

commit 5ea775a6b040a666e9012a952bcafc4f55656c9c
bump(goini): Add github.com/rakyll/goini dep

commit 907cca0f578a5316fb864ec6992dc3d9730ec58c
feat(env-vars): Allow fleet config to be set through env vars
bump(globalconf): Temporary bump to bcwaldon fork

commit 7796186eb2303cb4fecbff0d55a51dbccc98f96b
feat(env-vars): set tunnel and endpoint in env vars
Merge pull request #140 from bcwaldon/globalconf

Switch to rakyll/globalconf