Running "git rebase -i HEAD~3" won't always rewrite commits (progit#1278

)

Running "git rebase -i HEAD~3" won't always rewrite commits

Merge pull request progit#1274 from prosoitos/minor_fix_intro_help

Minor fix intro/help

Merge pull request progit#1273 from ChenSL86/change-order-of-the-thre…

…e-states

Change the order of the three states of files.

Merge pull request progit#1272 from SiarheiBobryk/the-head-after-git-…

…init

Specify the branch the HEAD points to on init

Merge pull request progit#1270 from katrinleinweber/1269-aggregate-co…

…re.editor-commands

Aggregate core.editor command list in Appendix C

Merge pull request progit#1268 from ScumCoder/notypo

Revert "one typo fixed" (6b82548)

Merge pull request progit#1265 from alfredmyers/errata

Revert Pull Request progit#1252

Merge pull request progit#1260 from SiarheiBobryk/extra-way-to-get-ma…

…n-page

Extend the git commands list to get the manpage

Merge pull request progit#1259 from SiarheiBobryk/head-file-content

Note about SHA-1 values in the HEAD file

Add extra notes about format for a commit object (progit#1258)

Add extra notes about format for a commit object