Version 1.19.0

New functionality

• Add support of auto value for start_offset transformation parameter
• Feature/keyframe interval support

Other changes

• Fix content range header in chunked upload (force US locale)
• Keep original filename in uploadLarge before sending the InputStream
• Update gradle for java 7 TLS fix (gradle/gradle#5740)
• Fix Api list tags test - verify the list instead of specific tags
• Cleanup upload preset from testGetUploadPreset (#129)
• Add int overload to TextLayer.letterSpacing()
• Fix responsive breakpoint format field implementation
• Separate modules to run on different travis jobs.
• Remove test02Resources test (broken and unnecessary).
• Fix raw convert error message test