Ignore metrics with 'null' metric values
Add test case for JSONContainer.toMetrics() with a null valued metric
Merge pull request #313 from lakshmi-kannan/bf_fix_null_metric_values

Ignore null valued metrics
Catch exception around converting JSONMetricContainer to metric objects conversion
Improve exception for metric type detection
Add test case for handling BigInteger
Merge pull request #314 from lakshmi-kannan/bf_big_integer_no_http_response

Big integers as metric values invoke no HTTP response from BF.
Force cast BigInteger to Double if it's less than Double.MAX_VALUE
log when a bigint greater than Double.MAX_VALUE is encountered
Merge pull request #315 from lakshmi-kannan/bf_big_integer_no_http_response

Force cast BigInteger to Double if it's less than Double.MAX_VALUE