Allow commit message to be overridden by git config.
Merge pull request #4 from boombatower/commit-message

Allow commit message to be overridden by git config.
Add $branch_name to `git fetch` to ensure extraneous branches are not fetched.
Add the $branch_name to the log message to be consistent.
Merge pull request #5 from boombatower/fetch-specific-branch

Add $branch_name to `git fetch` to ensure extraneous branches are not fetched
Merge branch 'master' of https://github.com/simonthum/git-sync