added write/marshal and bug fixes

v1.0.4

fix bug in the parser

Fix issue with empty lines and improve error handling

before now, the package will panic if it detects a recursion, this behavior has been changed to just an error being returned

Rename the package name

the package name was changed from goenv to goenvirement ,
to avoid conflict with the standard goenv library offered by go team

initial release

v1.0.1

updated readme file