add a better tail implementation

[mgoodings]

Current implementation can only get the latest event every 3 seconds. It's good for a top down check but not for a detailed log of all the events

[mgoodings]

v0.0.3 added better error handling and formatting for the tail command but it is still limited to one event every 3 seconds

[obazoud]

What about https://github.com/taimos/cfn-tail ?

[mgoodings]

@obazoud I'd like a pure bash solution it's just my knowledge of bash arrays and handling duplicates / lookups isn't good enough to pull it off.

If not I'd consider a Go binary for the tail implementation and separate it entirely since it won't have any impact on an actual deployment and goals of this project.