[#1692] fix int_validator
[#1692] int_validator: accept all-whitespace for backwards compat.
[#1692] add tests for int_validator
[#1692] fix int_validator tests and non-whole handling
[#1692] remove doc tests
[#1692] fix int_validator tests more
[#1692] suppress DeprecationWarning on test of invalid data to int_validator
[#1692] use assert_equals
[#1692] coding standards: single quotes
[#1692] coding standards: imports at top
[#1692] follow testing pattern proposed in #1672
[#1692] pep8
Merge pull request #1692 from wardi/fix-int-validator

fix int_validator