Added Selenium tests

[smarshy]

This PR is to add remaining tests from last week as well as the tests for this week. I am putting a separate PR so that it is easier to review. The tests include -

• test for job details
• 3 tests for shift details view (due to 3 test situations : when no volunteers are registered for a shift, when volunteers are registered but haven't logged hours and when hours are logged)
• 3 tests for checking that values in event, shift and job form are not lost when the page reloads
• test for checking if a shift can have 0 volunteers (validating max volunteer field)
• test to check that logged hours fall between the shift hours
• test for simplify shift

In addition to this, there are 3 more tests which have been commented out:

• 2 tests for checking that event is unique and job within event is unique. These have been commented out as the feature hasn't been implemented yet ( Job name inside an event should be unique #330 and Events name has to be unique #329 )
• test for simplify job (This test is not passing; I think the reason is because the js script is not updating the date in the form. i tried increasing delay but it sill doesn't seem to work)

Total tests that would run are 160 ( 150 original + 10 new + 3 commented out)
Related to issue #346

[coveralls]

Coverage decreased (-11.4%) to 82.78% when pulling 18ba8f2 on smarshy:selTest into 123f69b on systers:develop.