docs/quickstart: make projects directory usage consistent

Some places used [YOUR_USER]projects/[YOUR_PROJECT], some
[YOUR_USER]/projects/[YOUR_PROJECT],
replace with [YOUR_USER]/Sites/projects/[YOUR_PROJECT]
docs/quickstart: add note about workon
docs/quickstart: escape single asterisk
docs/quickstart: add fedora instructions
Merge pull request #213 from alon/quickstart-fixes-and-fedora

Quickstart fixes and fedora