v0.1.5

"Ad astra"

• Bump SDK to 1.5.1, add row filter support for Bigtable V2 API #93
• Allow flattenResults and destinationTable in BigQuery #88
• Add compression for HDFS output #85
• Add SCollection#closeAndCollect() in REPL #83
• Add BigQuery timeout #81
• REPL I/O commands #72
• Fix race condition in DistCache #69