[it] Edited chapter2

Cambiato storia in cronologia per essere consistente con il resto del libro
[it] Reviewing chapter2

Reviewed "Undoing Things"
[it] Reviewing chapter2

Reviewed "Changing Your Last Commit"
[it] Reviewing chapter2

reviewed "Unstaging a Staged File"
[it] reviewing chapter2

reviewed "Unmodifying a Modified File"
[it] updating chapter2

Reviewed "Working with Remotes"
[it] update chapter2

Updated titles
[it] updating chapter2

Reviewed "Showing Your Remotes"
[it] updating chapter2

Reviewed "Adding Remote Repositories"
Merge pull request #731 from daftano/master

[it] update chapter 2