Add missing header files, so 'include' directory has all needed files.
Add missing header files, so 'include' directory has all needed files.


Former-commit-id: ab641ea969fbb26599e2240b64aa287fccd5432e
clab/dynet,clab/dynet,clab/dynet,danielhers/dynet,xunzhang/dynet,clab/dynet,shuheik/dynet,clab/dynet,clab/cnn,chunyang-wen/dynet,chunyang-wen/dynet,shuheik/dynet,clab/cnn,chunyang-wen/dynet,xunzhang/dynet,clab/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,clab/cnn,xunzhang/dynet,danielhers/dynet,danielhers/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,chunyang-wen/dynet,danielhers/dynet,shuheik/dynet,shuheik/dynet,xunzhang/dynet,shuheik/dynet