185: got abstract matrix 2 working
#181: got add done
Merge branch 'master' into matrix
Merge branch 'master' into matrix
#185
Merge pull request #239 from rhsu/matrix

Matrix
#243
#243: Need to do some thinking on this
#243
#243: backup
#243
#243: push
Merge pull request #246 from rhsu/issue243

Issue243
Merge branch 'master' into MathFactory