Simplekml

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**Fixes**
* Changed newangle in :class:`simplekml.GxTrack` to :func:`simplekml.GxTrack.newgxangle`

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**New Features**
* Added a method :func:`simplekml.Kml.addfile`. This method adds additional files to a KMZ. Useful for adding
images to the KMZ that you want to display in a description balloon.

**Fixes**
* Fixed documentation of coordinates where it incorrectly showed a coordinate being first latitude, then longitude,
when it should have been the other way around
* Fixed paths included in a KMZ, changed backslashes to forward slashes

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**Fixes**
* Fixed the import error regarding networklinkcontrol

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**New Features**
* Added the property *gxballoonvisibility* to all features
* Added :attr:`simplekml.Kml.networklinkcontrol` to the :class:`simplekml.Kml`. Thus, there is a new class called
:class:`simplekml.NetworkLinkControl` and relevant properties (including :class:`simplekml.LinkSnippet`)

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**New Features**
* Added methods to all container classes for querying features already created. The new methods are: features,
allfeatures, geometries, allgeometries, containers, allcontainers, styles, allstyles, stylemaps, and allstylemaps
* Added a hint attribute to the Kml class that allows hints to be added to the kml tag, such as: *target=moon*

**Enhancements**
* The CDATA tags within text attributes are not escaped with the rest of the text and remain as is whether or not
parsetext of the Kml class is set to True or False

**Fixes**
* FlyTo is now generating the Abstract View (Camera and LookAt) tag correctly

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First production version release.