lock OpenCV imagedisplay properly
[readme] add missing cv-bridge dependency
changed CV camera calibration undistorter to 4-parameter format.
fixed bug when changing image-resolution with callibratino file
Merge pull request #7 from pierriko/master

[readme] add missing cv-bridge dependency
Fix typos in Readme.md
Merge branch 'master' of https://github.com/tum-vision/lsd_slam
Merge pull request #2 from tum-vision/master

同步master