renew index.md that root page on this site, #6
after install, check installed version, #6
write "Runnning Scala", #6
modify copyright year
planning about Scala Basics, #6
write Values and Variables, #6
make script tag plugin, #9
Merge branch 'feature/script-plugin' into feature/scala-basics, #9
use script tag for REPL interactive execution, #9
modify result trimming
start writing collections page, #6
Merge branch 'feature/scala-basics' into develop