Wrap all paragraphs at 80 characters

Cosmetic but large patch.
Simplification of a sentence
Missing space in documentation
Merge pull request #149 from stephane/docs-wrap-80

Docs wrap 80
Fix some typo
Merge pull request #150 from Kroisse/master

Fix some typo in the example code
Make escape error message more informative.
Check for items(), not dict instance to allow pseudo dicts.
0.4.1