fix filtering scenarios with specific tags
update for ruby enterprise edition
distinguished tags in variable
Merge pull request #314 from mefistofel1/fix-tag-expressions

fix filtering scenarios with specific tags
cleanup
v0.16.11
fix /dev/null not working in windows
v0.16.12
more universal windows detection
v0.16.13
windows cannot handle ./bin executions, so use ruby ...
v0.16.14
require base to get WINDOWS constant
v0.16.15
support negative tags
Merge pull request #319 from grosser/grosser/negtag

support negative tags
improve process finder on windows
v0.16.16
thanks for the help!
allow custom runner class names like MySpecialRunner