Add Integer trait type.
Add a couple of extra tests.
Add C-level fast validator.
FIX: PyLong_AsLongAndOverflow doesn't exist before Python 2.7; use PyLong_AsLong instead.
Add coverall badge to the README file, for github.
Merge pull request #122 from enthought/coverall-badge

Add coverall badge to the README file, for github.
Merge remote-tracking branch 'origin/master' into feature/integer-trait-type
Replace existing Int with the new Integer.
Remove mentions of  from the docs.
Revert unecessary whitespace change in docs.
Make compatible with Python 3.
Merge pull request #104 from enthought/feature/integer-trait-type

Add Integer trait type.
Fix MSVC build again
Merge pull request #123 from sjagoe/fix-msvc-build

Fix MSVC build again
Merge from master; fix conflicts in test_traits.py.