Use a simpler initial condition since we've fixed the pole problem

Fall back to the initial conditions of commit bfc712ba.  Set tolerance
to 1e-3 so we enforce forward Euler less frequent --- we only want
forward Euler near the poles.
Save for reproducibility

This commit of the code is used to compute the properties of photon
rings.  Simply type `make gr` to compile and run

  for i in {0..9}0 {0..8}5; do for a in 0.999 0.99841511 0.99748811 0.99601893 0.99369043 0.99 0.98415107 0.97488114 0.96018928 0.93690427 0.9 0.84151068 0.74881136 0.60189283 0.36904266 0; do echo $a $i; (time bin/gr a=$a i=$i) &> a=${a},i=${i}.log; mv 0000.raw a=${a},i=${i}.raw; done; done;

to obtain the data used in Chan, Psaltis, & Ozel (2013).
Merge commit 'ef6672e0' into photon-ring

Fix a minor bug that we discovered while merging photon-ring to
develop.  Luckily this bug does not affect the result of our
productive runs.
Merge branch 'develop' into photon-ring

Only update comments.
Save for reproducibility

This commit of the code is used to compute the projection of a uniform
Cartesian grid in the image plane to the equatorial plane of the black
hole.  Simply type `make gr` to compile and run

  for i in {0,6}0; do for a in 0.95 0; do echo $a $i; (time bin/gr a=$a i=$i) &> a=${a},i=${i}.log; mv 0000.raw a=${a},i=${i}.raw; done; done

to obtain the data used in Chan, Psaltis, & Ozel (2013).
Rename problems; prefix executables by "GRay-"
Update copyright years to include 2013
Merge branch 'photon-ring' into develop

Incorporate Makefile comments from photon-ring.
Merge branch 'projection' into develop
Compile and link successfully with OpenNI and NiTE
Track the head position and print its coordinate
Visualize the head of the controller
Draw the controller as a stick man
Use glScalef() instead of dividing coordinates by hand
Make control variables global to allow natural interaction
Fix bug: we forgot use glLoadIdentity(); improve namespace usage
Enable the hand(s) if it's perpendicular to the body
Basic controls: left for run, right for rotate, two hands for zoom
Disable NiTE and OpenNI by default; turn on by NITE=1 at compile time
Press 'h' to hide stick man