Corrected installation instructions
Crash fixed when postprocessing was unitalized and tried to delete it
Tracking improvements to track 100% automatically after the target is selected
Update README.md
Merge pull request #12 from mb354/dyson-dev

Merge in to develop branch:

* Execute loss recovery when it doesn't track.
* Removed some asserts that were causing trouble.
* Take into account the orientation of the robot when creating a patch for tracking the target
* Corrected m_pos when lost near the limits of the window due to offsets. 
Otherwise it get in a state where ncc2 returns 0 and lossRecovery never recovers.
* Speed up the loss recovery it computes cross correlation only on pixels divisible by 2.
* Tidy up to README