.gitconfig: Add aliases to find branches/tags/commits

Closes mathiasbynens#304.

.gitconfig

@@ -23,6 +23,14 @@
 	credit = "!f() { git commit --amend --author \"$1 <$2>\" -C HEAD; }; f"
 	# Interactive rebase with the given number of latest commits
 	reb = "!r() { git rebase -i HEAD~$1; }; r"
+	# Find branches containing commit
+	fb = "!f() { git branch -a --contains $1; }; f"
+	# Find tags containing commit
+	ft = "!f() { git describe --always --contains $1; }; f"
+	# Find commits by source code
+	fc = "!f() { git log --pretty=format:'%C(yellow)%h  %Cblue%ad  %Creset%s%Cgreen  [%cn] %Cred%d' --decorate --date=short -S$1; }; f"
+	# Find commits by commit message
+	fm = "!f() { git log --pretty=format:'%C(yellow)%h  %Cblue%ad  %Creset%s%Cgreen  [%cn] %Cred%d' --decorate --date=short --grep=$1; }; f"
 
 [apply]
 	# Detect whitespace errors when applying a patch