Update to curl from private repo

Requires following env vars:

GITHUB_TOKEN
GITHUB_OWNER
GITHUB_REPO
Update to use bash double bracket notation for tests
Capture ant_status for evaluation
Merge branch 'master' into feature/93-deploy-to-pvt-github-repos
Use $? to determine exit status
Update to use double brackets in evaluation constructs
Merge branch 'master' into feature/93-deploy-to-pvt-github-repos
Merge pull request #100 from SalesforceFoundation/feature/93-deploy-to-pvt-github-repos

Feature/93 deploy to pvt GitHub repos