Tests: Fixed 'requires_boto_gte' to apply to target test only.
Tests: Tweaked a general test to be compatible with Boto 2.7, attribute check is redundant with a specific version-gated test.
Tests: Tweaked two tests to be compatible with Boto 2.7, now-removed kwarg has its own version-gated test.
Tests: Tweaked two tests to be version-gated to Boto 2.8+.
Merge pull request #202 from DreadPirateShawn/TestsFixSkipDecorator

Tests: Fixed 'requires_boto_gte' to apply to target test only.