Step 1: From your project repository, bring in the changes and test.
git fetch origin
git checkout -b steven origin/steven
git merge master
Step 2: Merge the changes and update on GitHub.
git checkout master
git merge --no-ff steven
git push origin master
Conflict with binary files:
git checkout --theirs -- path/to/conflicted-file.txt
git checkout --ours -- path/to/conflicted-file.txt