User related code updated, autoload config updated, global js updated

- user_session library is autoloaded now
- Layout view now checks user privilege for displaying
  alternate header links (login/logout, register, home, etc).
- Created a redirect function in global.js for redirecting user to
  another page
- Created a general message view, used for quick messages.
- User is redirected to home page after logging in

Installition wizard started and security update

-You can now run navigate to
http://YOURSITE/SYNERPATH/index.php/install to create the appropiate
tables.
-If controllers are accessed directly a error message is printed out.

Merge branch 'master' of github.com:Syner/Syner

Removed sensitive data from database.php

Username and password for a database was stored in the file. Please, use "git
update-index --assume-unchanged database.php" if you are just adding personal
log in information.

User registration and Simple_json library updated

User registration code changes:
-User registration page now has ajax code to check for error responses
for a registration request. Lets user know if there input was invalid or
username/account name was already taken by displaying text next to its
input field.

Pending_users model modifications:
-model view was created
-able to check if a username exists based on username and/or email. This
only checks the pendin_users table.
-Able function inser_entry to add a user to the pending_users table.

Simple_json library modifications:
-replaced add_simple_response function with a more fitting name,
add_error_response