add DatabaseInterface.java, Database.java and update parserMain and unit test file
update Database.java and DatabaseInterface.java and parserMain.java
Add SendEmail class and renew ParserMain
update parserMain,java and SendEmail.java
Add jyaml library
Using snakeYaml instead of jYmal
SendEmail.java: Read HostEmail Data from the file "EmailData.yml"
.gitignore: Ignore EmailData.yml.