fix LibGreenTea.ts
Merge branch 'master' of https://github.com/GreenTeaScript/GreenTeaScript
basic support background job
support timeout
fix SubProc.kill()
fix try-catch bug
fix dshell exception
fix trace requirement message
add dshell script to Makefile
bugfix array cast
impl dlog statement
update dshell test
Merge pull request #14 from OkamotoYuki/dlog

impl dlog statement
add basic multiple pipe support
fix pipe multiplex
fix dshell.green
fix boxBoolean
Merge branch 'master' of https://github.com/GreenTeaScript/GreenTeaScript
fix conflict
bug fix at TypeVarDecl