Parser : rename group into section
#54 - Add parser unit tests
#54 - Group parser skeleton
Enhance syntax error messages : add line number
FIX typo
#54 - Add group parser
Add postParse step
 #54 - Handles groups in parser
Use constant
#54 - Handles groups in reader
Refactor
Merge pull request #55 from Niktux/54-env-group

Closes #54 - Handles environments group