Added chromatic aberration correction

-disabled by default (tends to mangle the text even when it shouldn't)
-enable/disable using r_oculusrift_chromabr cvar
Merge pull request #4 from dghost/pull

I added support for chromatic aberration correction
Merge remote-tracking branch 'upstream/master'
Added r_oculusrift_aimmode. 1 for mouse aim. 2 for head aim.
Fixed player start facing the wrong angle, thanks @dghost
Added r_oculusrift_showweapon to show/hide weapon
Fixed a bug where lens_separation_distance should be used instead of ipd in the equation for h
HMD settings pulled from the Oculus SDK
Show the user their IPD in the console when the rift is activated
Allow the user to manually correct drift by having the 'center view' key reset the HMD orientation
Update version to 1.5
Fix 'r_oculusrift_aimmode 2' to use pitch from HMD for aiming
Switched r_oculusrift_aimmode 1 and 2
Always safe r_oculusrift_* settings to config
Made loading hmd_settings a bit easier
Cleanup
Added some more r_oculusrift_aimmodes
Removed extranous check for crosshair
Removed r_oculusrift_showweapon; use r_drawviewmodel to hide weapon or screen size setting to hide status bar
Removed oculusrift check for bob. Use cl_bob 0 to disable bobbing