update box to ubuntu 14.04
Merge pull request #27 from AmeBel/vagrant

update vagrant box to ubuntu 14.04
Update relex2logic-rules.txt

correct the ENTITY rule
Merge pull request #28 from ruiting/patch-1

Update relex2logic-rules.txt
changes on unit test
Merge pull request #30 from rodsol/r2l

changes on unit test