Merge pull request #4 from rinatkhaziev/master

Prevent PHP Fatal errors when the class is included multiple times
Merge pull request #5 from rinatkhaziev/master

Coding standards, getting rid of singleton in OOP example, making sure no class/function collisions happen
actions added on section form
singleton removed

Singleton instance removed. Returned $this from set fields so that adds method chaining support. Added hidden field on checkboxes.
unneccessary code removed. method chaining added.
Revert "unneccessary code removed. method chaining added."

This reverts commit d4be4769ba1b788a0525fc19ed7c8fba436caaae.
Added two new fields

File field uses thickbox media uploader and simply copies the url back
to the input field.
Password field outputs a simple password field.  Security on field is
minimal, password is output back to the field value after saving.
Support all file types

Support other file types beside images in file field.
Merge pull request #7 from jeremyclark13/master

File uploader and password field added
Unescaped quotes

Forgot to properly escape quotes.
Merge pull request #8 from jeremyclark13/master

Missed escaping quotes