Update HW1/student/Makefile

Remove redundant lines
Compile main.cpp with OpenCV headers

Before I made this change, compilation with make failed with the
bellow included error. I do not claim THIS is the way how it should
be fixed, but I want to tell you there is a problem and that this
fix works for me. Thanks for your consideration.

…
g++ -c main.cpp -O3 -Wall -Wextra -I /usr/local/cuda/include
In file included from main.cpp:28:
HW2.cpp:1:33: error: opencv2/core/core.hpp: No such file or directory
HW2.cpp:2:39: error: opencv2/highgui/highgui.hpp: No such file or directory
HW2.cpp:3:30: error: opencv2/opencv.hpp: No such file or directory
In file included from main.cpp:28:
HW2.cpp:9: error: ‘cv’ has not been declared
HW2.cpp:9: error: expected constructor, destructor, or type conversion before ‘imageInputRGBA’
HW2.cpp:10: error: ‘cv’ has not been declared
…
Merge remote-tracking branch 'upstream/master'
Should use include-path instead of lib-path
fixed minor error in main
adding slides to unit #3 and unit #4
adding device query code
Merge pull request #2 from has207/master

Small cleanup to my previous pull request
Merge pull request #3 from jirkadanek/master

Fix a compilation problem when OpenCV includes are not in standard include path
Merge pull request #4 from mortennobel/patch-1

Should use include-path instead of lib-path
adding unit 5 hw and code snippets
adding unit 5 hw and code snippets
Update main.cu

Added const in computeHistogram declaration for consistency and added conditionals to be able to run it on Windows and/or Linux.
Merge pull request #7 from macias/patch-1

Update main.cu
Merge latest Udacity code; resolve timing output conflict in HW4/main.cpp