Better error reporting for setup.py (#863)
Better error reporting for setup.py (#863)

* Updated print commands
* More robust paths


Former-commit-id: a87b209a7de99e98d7507265eef961760eb302f0
danielhers/dynet,xunzhang/dynet,shuheik/dynet,xunzhang/dynet,danielhers/dynet,clab/dynet,clab/dynet,clab/cnn,clab/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,shuheik/dynet,xunzhang/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,chunyang-wen/dynet,shuheik/dynet,chunyang-wen/dynet,shuheik/dynet,shuheik/dynet,clab/dynet,clab/cnn,xunzhang/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet,danielhers/dynet,chunyang-wen/dynet,danielhers/dynet,clab/cnn