Pyexchange

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* Python 3 conversion complete! yaaaaaaaaaay

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* Bugfix release because we broke stuff :(

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** This release has a potential backwards incompatible change, see below **

* Pyexchange uses requests under the hood now (trustrachel)

Hey did you know that requests can do NTLM? I didn't. The internal connection class now uses requests
instead of the clunky urllib2.

There's a backwards incompatible change if you're subclassing the connection object. Requests doesn't
need nearly the crud that urllib2 did, so I changed some of the methods and properties.

Almost nobody should use this feature, but beware if you do.

* You can get a list of events between two dates. This was a big limitation of the library before, so a huge
thank you to Eric Matthews (ematthews))

* Fixed bug causing retrieved events to not be in UTC. (Thanks to Alejandro Ramirez (got-root))

* Integrated with travis (finally).

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Alejandro Ramirez (got-root):

- Bug fixes around the new folder code.
- More documentation on how to use folders.

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Turns out I actually didn't release Ben Le's code when I thought I did. Bad release engineer, no biscuit.

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We had some great contributions, so this is a release for that.

Alejandro Ramirez (got-root):

- Added functionality to create/delete/get/find/move folders of all types. (Creating a new CalendarFolder is creating a new calendar in exchange)
- Added ability to create events in specific folders.
- Added ability to move events between calendars (folders).
- Created tests for all new features.

Ben Le (kantas92)

* Fixed unicode vs bytecode encoding madness when sending unicode.