Adding Ubuntu dependencies instruction to Readme.

Adding link section at the end of the Readme.
Using links in Readme dependency list.
Improving clarity in running instructions.

Correcting run all path in running instruction.
Simplifying Ceres Ubuntu instructions.

Adding links to gflags and glog packages.
Moving SuiteSparse information to Ceres part since it belongs there.
Merge pull request #4 from oscarlorentzon/feature/readme-ubuntu

Update of Readme with Ubuntu instructions
Remove jhead dependency on README.

Using exiftool now.
multiview: add initial version similarity transform with ransac
reconstruction: add merging
reconstruction: set inliers threshold for merging
Viewer: fix bug when changing cameraSize.
Viewer: add image texture at background.
reconstruction: normalization in triangulation
Viewer, move on double-click. Add imagePlaneSize option.
reconstruction: adapt triangulation
Viewer: use keys to move between cameras.