1) Added a complete list of GRE 3000 words
2) Added Word Details for selected word
3) Added Word List and setup for future support of customizable word list
4) csv file now do not need to give full definition, the missing definition can be automatically fetched from the GRE 3000 words database
5) fixed a bug of identification section that after you click next, you have to double click a label to have it selected.