Make sure all dependencies are installed

[mitchellwills]

Right now I know that there are at least a few build dependencies that are not installed by rosdep. These are:

• [x] git
• [x] subversion
• [x] yasm

[zenified]

The following are a few addition dependencies which I encountered while building the package -srtp -libjsoncpp-dev -nasm

[mitchellwills]

srtp and libjsoncpp-dev should have been installed by rosdep. Also nasm should not be needed if yasm is installed