Minor cleanup

Comments, removing unnecessary fields from IDL data type, fixed video
rate.
Merge branch 'master' of https://github.com/rosemwahlin/rticonnext-usecases
Added/updated READMEs, minor comment change

- New README for VideoData example
- Updated READMEs for other examples to fix directory structure
- Minor change to comments in the .idl file to be more clear.
Merge pull request #16 from rosemwahlin/master

Removed unused fields from IDL, finishing changing to relative paths.