New test for Places NearBy search and tests for Places pagination

Follow-on tests for pull request #29

Also fixed a broken test due to lon/lat changes from Google maps.

I created a new test Class, PlacesSearchTests since I noticed you had no existing tests for this set of APIs.  I did not put it into the IntegrationTests class to match the existing PlacesDetailsTests and PlacesTextTests.  Feel free to move the tests I wrote to a different class if you wish.

Finally, would love to get these tests and pull request #29 integrated into your NuGet package!