Merge pull request #1 from Pater1/Pat-dev-line

added some things you might like
add MathProblems git to this git
Merge pull request #3 from connerk/Dev_Ring

Merge
Added DXF Lib
Merge branch 'master' of https://github.com/connerk/Models
Merge pull request #4 from Pater1/Pat-dev-line

I fixed it!
Update
Merge branch 'master' of https://github.com/connerk/Models