Added new attributes for automation_session object and updated endpoint#2

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hanikhan wants to merge 3 commits intobrowserstack:masterfrom

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Commits on Jul 29, 2018

Added browser_console_logs_url, har_logs_url, appium_logs_url to the json returned for session details. Also updated REST API endpoint to reflect latest BrowserStack API endpoint: https://www.brows…
Hani
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Commits on Aug 7, 2018

changes method names to camel case
Hani
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Added zero length string check, updated variable name to reflect camel case and added comments to tests
Hani
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