Added functions for bound entangled states 'HorodeckiState' and 'BreuerState'
Added 'DickeState.m' and 'unique_perms.m' function in the helper folder
Changes to comments in Dicke state
Added appropriate comment headers and opt_args to HorodeckiState.m
Added GisinState.m, GHZState.m, and WState.m
Merge pull request #1 from vprusso/master

Added functions for bound entangled states 'HorodeckiState' and 'BreuerState'