Merge pull request #1 from erikvold/master

The `_` char should be allowed in email style ids
add tests for underscores being valid
inc to v0.0.2
Do not translate invalid 'id', as this should fail. Fixes #2
Increment to 0.0.3
Update documentation with changes in #2
Improve validation to be inline with what AOM accepts. Increment to 0.0.4