Stahp updating bundler

Install bundle before building

Merge pull request progit#943 from agowa338/patch-1

Mention PowerShell Repository

Fine, build the book again

wups

Debugging build issues

Merge pull request progit#941 from aollier/bzrignore

taking into account the syntax of Bazaar

Merge pull request progit#957 from tansaku/patch-1

indicate what running git from the terminal actually is for a newbie

Merge pull request progit#955 from yunhailuo/issue950

resolves progit#950 - Mislabel in figure 69

Merge pull request progit#942 from TopView/patch-1

fixed minor grammar mistake