Typo "&mp;" -> "&amp;"
hanging indent bibliography, remove 5x size

Setting the bibliography as a hanging indent matches the official book.
Typo "&mp;" -> "&amp;"
Typo "&hellpi;" -> "&hellip"
Add missing spaces after comma
Move a space outside of the <em>

Incredibly minor and probably doesn't impact the final render, but makes it symmetrical with other formatting.
Merge branch 'master' into cleanup-thanks
Merge pull request #14 from AlanDeSmet/cleanup-thanks

Cleanup thanks_and_acknowledgements.htm