import scala converter to convert between java and scala collections
add new metric type
clean up comments
restore build.sbt version
Merge pull request #48 from kimyen/develop

Question: Correct vs Incorrect
take out time controller for file download report, report all download
history instead
add a button to file download report ui
fix the bug in file download report
use match case instead of if else
refactor code
Merge pull request #51 from kimyen/develop

File Download Report Changes
Remove redundant semi-colons.
UI perf update.
Merge pull request #52 from eric-wu/master

UI perf update
add Trending HTTP status code (percentage) and fix bug on question
metric
change name and description
better label for trending charts
change the vertical space
interactive legend
fix bug