Add keyboard shortcut for rebasing
magit-file-log: follow renames

When doing a log for a particular file (using `magit-file-log') it is
useful to see the history of the file across renames. Add the --follow
option to the log command to do so.
Update README.md

typo fixes
Merge pull request #1113 from prathamesh-sonpatki/add-rebase-shortcut

Add keyboard shortcut for rebasing
Merge pull request #1116 from mgalgs/file-log-follow

magit-file-log: follow renames
Merge pull request #1119 from cringthis/patch-1

Update README.md
magit-stash-{apply,pop,drop}: new commands

Use them from the stash popup and in section actions.
magit-diff-stash: add to stash popup