Fix SimpleSend examples in Readme by surrounding values with quotes
Merge pull request #2 from adjust/fix/readme/examples

Fix SimpleSend examples in Readme by surrounding values with quotes
Merge pull request #3 from adjust/send-metric-error

Return error from function SendMetric
Add Metric.String() function for quick logging
Extract Metric into metric.go
Merge pull request #4 from adjust/extract-metric

Extract Metric into metric.go, add String() function