Fixed User Servlets & cleaned up pom.xml & added new servlet in web.xml

Modified:
pom.xml - removed resources folder for chat log
RegisterServlet.java - all servlets handling user logic returned error
codes even though success was achieved. Changed to only return error
info if failure was encountered.
UnregisterServlet.java
RegistrationIdServlet.java
PasswordServlet.java
web.xml - added get all chat logs servlet & removed hello servlet

AuthoredBy: colinkho