Fix timezone issues in EwsUtilities and ExchangeServiceBase.

Timezone should be set to UTC explicitly to work on systems with non-UTC timezone.
Remove unused methods from ServiceRequestBase.

- ServiceRequestBase.emit() is unused.

- ServiceRequestBase.endGetEwsHttpWebResponse() is unused, but also
  incorrect: Why would one compare an HTTP status code with an enum
  ordinal?!
Remove commented call to ServiceRequestBase.endGetEwsHttpWebResponse().

Also removed a getter call without assignment and some other commented
code in SimpleServiceRequestBase that made no sense.
Enabled preemptive authentication in HttpClientWebRequest, reducing connection overhead.
Fix javadoc errors as reported by IntelliJ
Fix #62: validatePropertyAccess() in UserConfiguration is wrong

The condition for the if statement inside this method was reversed.
Fix #67: Implement Travis continous integration
Fix #67: Add build status to readme
Merge pull request #22 from eveoh/preemptive-authentication

Enable preemptive authentication in HttpClientWebRequest
Merge pull request #27 from eveoh/unused-methods-in-servicerequestbase

Remove unused methods from ServiceRequestBase
Merge pull request #6 from eveoh/timezone-fixes

Fix timezone issues in EwsUtilities and ExchangeServiceBase
Fix #33: EwsXmlReader uses == to compare Objects
Fix #9: ExtendedPropertyDefinition.equals() is flawed
Rename XMLNodeType to XmlNodeType
Fix #31 and #32 remove useless null checks
Rewrite ExtendedPropertyDefinition.isEqualTo() for readability
Fix #11: Invalid downcast check
Merge pull request #70 from vboctor/Issue9

Fix #9: ExtendedPropertyDefinition.equals() is flawed
Remove extra semi-colons causing IntelliJ warnings
Fix spaces before semi-colons