add support for capturing stdout in tests
rework and also support mocking stderr
add missing super call for tearDown in EnhancedTestCase
override setUp rather than constructor in EnhancedTestCase
fix remarks
Merge pull request #145 from boegel/capture_stdout

add support for mocking stdout/stderr in tests
Merge branch 'master' into avail_subclasses
fix issues in avail_subclasses_in function, refactoring and enhance tests
bump version to 1.9.8
fix error message, enhance ImportError raised in try_import inner function with error msg