Adds Travis-CI configuration.
Temporarily disables PyLint validation.

Rationale: PyLint triggers import errors on Travis' Linux builds because
pywin32 is not available there (as expected).  PyLint validation will be
re-enabled once we fix all warnings on all platforms.
Prevens import errors when building documentation on Linux.
Fixes documentation build on Linux.
Stop running Windows tests on Travis-CI, which only runs Linux.
Removes sleep, which seems to be ignored on Travis-CI.
Merge pull request #2 from AndreLouisCaron/travis-ci

Adds Travis-CI configuration.