Merge pull request #1 from alexanderpa/master

fix of unrelate command
node 0.8 obsolete, remove from travis build, require seneca 0.5.20
bump version 0.1.3
now safe to call remove$ with the callback fn the single argument
Merge pull request #2 from iantocristian/master

fix cmd_relate, should not attempt to load parent when the card does not...
a bit of refactoring on card_remove
refactored test
test cleanup, more refactoring
remove card also removes children, closes #1