no need to qualify Python interactive sessions

Sphinx automatically notices them as Python snippets and gives
them syntax highlighting.

These snippets are also too short to deserve linenos.
Merge pull request #941 from stevepiercy/master

place colon within strong style
Merge pull request #940 from tshepang/diff

no need to qualify Python interactive sessions
Merge branch 'master' of github.com:Pylons/pyramid
improve description; fix link
mention a coding convention
Merge pull request #946 from tshepang/diff

improve description; fix link
use clearer language
Merge pull request #947 from tshepang/clarity

use clearer language
fix #948
Merge pull request #949 from tshepang/patch-1

fix #948
Spaces and dots may now be in mako renderer template paths. Fixes #950.
Added name to CONTRIBUTORS file.
fix link
enable Sphinx cross-referencing for pyramid_toolbar
Merge pull request #955 from tshepang/toolbar

toolbar-related doc improvements
grammar
Merge pull request #957 from tshepang/patch-1

grammar
Merge pull request #945 from tshepang/imports

mention a coding convention
remove copyright bits from the scaffolds

see https://github.com/Pylons/pyramid/pull/953#issuecomment-15650552