add Database Class
test register
test register suceeded
test idea commit
change database to access

to implement that, replace jdk8 64bit with jdk7 32bit T-T
remove dependency on mongodb
test create team

succeeded.Remember the context directory of XXX.jsp is web.
fix
fix
add signin and signup (lack of function)
temp
Merge branch 'new_branch_name'

Conflicts:
	web/pages/front_end/index.html
	web/pages/front_end/index.jsp