finish update and delete part of db class.
update test cases for update and delete function for class db.
Merge branch 'class-database'

Conflicts:
	Server/src/db.php
	Server/test/db_test.php
finish a basic version of select function
Merge branch 'class-database'

Conflicts:
	Server/test/db_test.php
add config file (define constant like DB_HOST, etc.).
fix connection info for db test.
add DB_NAME to config file
add load file.
add some fixes on db test file.
Merge branch 'master' into upload-module
Basically finish the upload function. Still need to complete the process the post arguments.