ignore .pdfs, since they can be generated from the .tex sources
Added waferdiameter.tex

I had a discussion about scintillator wafer sizes with a client and needed to clarify some details, thus made a small drawing.
Moved explanations

Moved explanations of the files from README to the header of each file. Makes the repo a little bit easier to maintain.
Merge branch 'master' of https://github.com/habi/latex
booktabs-example cropped down to only show the table in the output