Rename read_csv to genfromtxt about matrix HOT 1 CLOSED

The naming scheme and use of Matrix methods should be similar to that of Python NumPy. Accordingly, read_csv method should be changed to genfromtxt.

Steps to follow:

1. Update the read_csv method in matrix_read.hpp to take delimiter as an argument.

2. Rename read_csv to genfromtxt and add it in matrix_operations.hpp

3. Delete matrix_read.hpp and update Matrix.hpp to remove the statement which includes matrix_read.hpp

4. Update the README.md accordingly

5. Rename examples/read_csv.cpp to examples/genfromtxt.cpp and update the example accordingly.

6. In examples/CMakeLists.txt, update the line add_executable(read_csv read_csv.cpp) to add_executable(genfromtxt genfromtxt.cpp)

7. Rename benchmark/BM_read_csv.cpp to benchmark/BM_genfromtxt.cpp and update the benchmark to use new method name.

8. Delete benchmark/linux_binaries/BM_read_csv and generate new binary using `g++ benchmark/BM_genfromtxt.cpp -std=c++11 -I./include/ -isystem ./lib/benchmark/include -L./lib/benchmark/build/src -lbenchmark -lpthread -o ./benchmark/linux_binaries/BM_genfromtxt`

9. Rename BM_read_csv in benchmark/BM_all.cpp to BM_genfromtxt update the method call according to the new name. Also, position the method according to lexicographical order.

10. Recompile benchmark/BM_all.cpp using `g++ benchmark/BM_all.cpp -std=c++11 -I./include/ -isystem ./lib/benchmark/include -L./lib/benchmark/build/src -lbenchmark -lpthread -o ./benchmark/linux_binaries/BM_all`

Note: All the above steps should be a part of one commit with the message "Renames read_csv to genfromtxt".

@Makaveli I have added step 6.

from matrix.