PHPRtfLite 1.0.0 released

I'm happy to announce the 1.0 release of PHPRtfLite. The changes are as follows:

- Autoloader now validates class names for better security
- Replaced class PHPRtfLite_Note to PHPRtfLite_Footnote and PHPRtfLite_Endnote, because it's more clear and a better OO-Design
- Bugs fixed: #2971336, #2969964