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Update README.md
Added assertions steps to beginning of tests to help Selenium RC sequences fail fast in case when UI was not launched correctly. Modified crteate-security-group-with-rules test to type in port 22 for SSH rule.
Updated create-s-group-2-with-rules-from-dashboard.htmlto type in ssh rule.
Updated add-rules-to-empty-s-group-3.html to type in ssh rule.
Added waitForVisible before logged in verification
Merge pull request #600 from aliceh/develop

Modified  create security group_1 test to type in port for SSH rule. Modified  create security group_2 and 3 tests to use type after select in the chosen widget. Added assertions to help timeout faster failing tests.