shut down carriers before disconnecting from net
emit error if attempt is made to modify null bottle, see #258
copies of null bottle are not read-only
[ros] rescue yarp->ros image transmission
[ros] test image transmission in both directions
Add option for changing video modes (resolution and FPS)
Add safeguards for choosing modes
Add separate info output for video modes
Update comments
Add mode ID info to ouput
added paper and modified formatting of references
Merge pull request #261 from kt10aan/master

OpenNI2 driver updates and improvements
[doc] document impl::PortManager