Support '}' characters in commit messages

.githelpers:pretty_git_log() used a close-curly-brace '}'
as a column separator, however this breaks when the commit
message contains that character.

Change it to use a rare control character to avoid this problem.
Merge pull request #14 from nmagedman/master

pretty_git_log: Support '}' characters in commit messages
Merge https://github.com/garybernhardt/dotfiles
Revert "Merge https://github.com/garybernhardt/dotfiles"

This reverts commit 65c0a22f82ec965927f6898f345cb919dfe3579c, reversing
changes made to be27c1b4497f73e689b2266757dca9fe58a0fb81.