Minor clean up
Merge pull request #1025 from pdalpra/cleanup

Minor clean up
Minor clean up, make SessionDeltas explicit instead of using Tuple2[Int, Int]
Bring HtmlHelper.htmlEntityToInt back to life, used in VTD-XML extension
Remove param and queryParam versions that don't specify value, close #1026
Minor clean up
Fix build
Make check transform step Option => Option, close #1027
Minor clean up
Make Validation.sequence tailrec
Preserve Validation sequence order
Fix non exhaustive pattern matching
Don't convert List when only folding
Minor clean up
Fix connectionPoolingEnabled test