Update README.md

Fix a typo error
Merge pull request #6 from pmoulon/master

Update README.md
Update README.md
default camera model is now loaded from svo_ros and not from rpg_calib
added ros parameter to disable user input thread.
new flag to display debug output for plain cmake-projects
added missing include
use environment variable for plain cmake projects to locate dataset folder
added flag to build without ROS as plain cmake project
default is to build with ROS/Catkin
Merge pull request #10 from uzh-rpg/feature/plain_cmake_build

Build svo without ROS/Catkin
remove rviz node from test launchfile since it doesn't work with everyone (different ROS versions, screen resolutions)
cleanup launchfile for live camera
Merge branch 'master' of https://github.com/uzh-rpg/rpg_svo
set default compile flag for HAVE_G2O to FALSE
Update README.md
added figures to illustrate notation
Merge branch 'master' of https://github.com/uzh-rpg/rpg_svo
Update README.md
added instructions on how to download test data. updated all tests for new dataset.