add mst experiment
misc
add conclusion for task 3,4,6
Merge pull request #71 from spininertia/master

add mst experiment
Merge pull request #72 from pondering/master

add source code appendix
elaboration
Merge branch 'master' of github.com:essex405/graph-mining-rdbms
Merge pull request #73 from spininertia/master

elaboration on proposed method