Fixed according to Dr. Kopf's comments

- Class diagrams missing on slides 5-7
- slide 7: easy -> Easy
- slide 11: nginx -> Nginx;  do not forget to explain the functionality
of all tools/modules
- slide 14: green text too small
- slide 17: less size overhead -> less overhead; XMI -> XML
-slide 20: Sigmoid transformation not clear; what is "m_i" in equation?