bigQueryR 0.4.0

• support nullMarker, maxBadRecords, fieldDelimiter in upload jobs
• Support BigQuery type DATE for R class Date data.frame columns (BigQuery type TIMESTAMP still default for POSIXctcolumns) (#48)
• Allow custom user schema for uploads of data.frames (#48)
• Rename misnamed global functions from bq_ prefix to bqr_ prefix
• Add allowJaggedRows and allowQuotedNewlines options to upload via bqr_upload_data()
• bqr_get_job now accepts a job object as well as the jobId
• Fix bug with bqr_upload_data where autodetect=TRUE didn't work with gcs:// loads from Cloud Storage
• Fix bug with bqr_query() that caused a 404 error sometimes.