Created core folder that includes 3 php files.

In the core folder ther is 3 file core.php, errors.php, and
includes.php. Core.php creates all the definitions in this project.
Errors.php defines all the error codes called if somthing goes wrong
with the script. Incluedes.php is the file that will eventually include
the mysql database information.
Merge branch 'master' of https://github.com/djburkhart/Xternal-Blogger