Gauge Java v0.7.4

Enhancements

• Remove platform-specific artifacts. The release artifacts are platform-agnostic now. #324
• Write screenshots to file getgauge/html-report#213
• Use gRPC for communicating with gauge getgauge/gauge#134

Bug Fixes

• #350 - Unable to capture screenshots if screenshot_on_failure is set to false
• #348 - Custom screenshot Grabber takes blank screenshot