Moving all the contests into a single repo

Before this change, I had a repo for each programming
contest(Google-Codejam, icpc-training, infoarena, Timus, Topcoder). I
decided to move all the repos into a single one (Programming-Contests),
due to space constraints(limited number of repos). Note that this commit
will look like this files are new(no history is transfered). But I did
check the history beforehand and added files: ''Xtra_SRM_578_dfs.cpp",
"Xtra_I_Bitmatrix.cpp", "Xtra_I_BitmatrixAndLUT.cpp". The rest of
history is irrelevant.