fix for 2.0

add error handler, exception for injection

BIG CHANGE

So I re-structure code, and write more comment to be easier for those who want to develop/custom some config
Also I improve more security to salting mechanism (the original one was very very risky)

FTR: delete lib that not necessary

Merge pull request #1 from P-CAST/add-license-1

Create LICENSE

wrong id handler

Handler the wrong id type in view function,return "Error id" and go back to func() if its not integer

Comfortable update

In older version if you want to view/insert/delete again you need to openup program again,so this update is to return to start once you login and doesn't close the program.

Minor update

Hide password while typing.

Security update

User have to enter username and password for database and master password for key to encrypt-decrypt password

open beta

This is beta version of passwordmanager.