Update about_classes.py
Merge pull request #75 from ab7/patch-2

Update about_classes.py
Update about_classes.py
Merge pull request #76 from ab7/patch-3

Update about_classes.py
remove useless import and change indentation according to pep8
extra whitespace trimmed
Merge pull request #79 from gmunkhbaatarmn/patch-1

extra whitespace trimmed
AboutRegex missing from collector

Fixes #81
Makes regex example self explanatory.

20 == `re.DOTALL | re.LOCALE` doesn't makes much sense here and can be confusing for a beginner.
also 10 == `re.IGNORECASE | re.MULTILINE` why overcomplicate it when the `string` doesn't even have a newline?
Fix tuple creation koan
add example with zero in a string to true_and_false koans
Merge pull request #77 from YCFlame/master

remove useless import and change indentation according to pep8
Merge pull request #82 from Walkman/patch-1

AboutRegex missing from collector
Python3 version of suit also needs AboutRegEx in the suite
Merge pull request #83 from Walkman/patch-2

Makes regex example self explanatory.
Merge pull request #84 from karptonite/patch_tuple_koan

Fix tuple creation koan
Merge pull request #85 from karptonite/add_zero_string_to_koan

add example with zero in a string to true_and_false koans
Fix typo
Fix typo
Merge pull request #86 from ChuntaoLu/patch-1

Fix typo