Rename iteration files, add to pip2 source
remove parens from print statements
revert ps1 pre-solns
Merge branch 'book-updates-iteration' of https://github.com/aerenchyma/runestone into aerenchyma-book-updates-iteration

Conflicts:
	pip2/source/Assignments/ps1.rst
Merge branch 'aerenchyma-book-updates-iteration'
first release of week 3 for pip2