added functionality to check file size
Added functions to convert bytes
Added file type checking

Created functionality to allow all file types. by default an extension
is added after files that could be harmful. This extension also has a
default up ‘.upload’ but can be customized. if a blank string is passed
as the customized extension then no extra extension will be added.
Merge branch 'dev'

Conflicts:
	src/foundationphp/UploadFile.php