fix Processs option flag
commit to merge
fix subproc exception
merge
create alias in dshell.green
add process timer
fix dshell stringliteral
moving GetEnv and IsUnixCommand to DShellGrammar
removing ParseExpression in GreenTeaUtils
removing GreenTeaType
refactor dshell
fix conflict
add basic support background job
refactor GtSubProc
adding ParseFileOperator
Merge branch 'master' of github.com:GreenTeaScript/GreenTeaScript
bug fix at Dshell
several fix
Merge branch 'master' of github.com:GreenTeaScript/GreenTeaScript
disabled StringInterpolation because it is not set QuoteFlag