Removed the 'fixed' constraint from URIObjectType@type, closes #9

Also bumped the version number for the URI_Object and all downstream objects:

* DNS_Query_Object
* DNS_Record_Object
* HTTP_Session_Object
* Link_Object
* Whois_Object
Added schema annotations to the Link_Object, closes #18
Changed the type of LinkObjectType/URL_Label from xs:string to cyboxCommon:StringObjectPropertyType, closes #19

This will allow for the use of the standard CybOX Object Property Type fields on the URL_Label
Made the LinkObjectType/URL_Label field optional, closes #21

This allows for the use of links without a label.
Updated the annotations for cyboxCommon:TimeType to make them generic, closes #29

cyboxCommon:TimeType is used throughout CybOX and STIX on many types of nodes but the annotations referred specifically to observables. The annotations are now generic and refer to "this construct".
Fixed the docs on the Links element in the Email_Message_Object to specify use of the LinkObjectType, closes #32

It previously specified use of the URIObjectType, which is not the best fit. The version number of the Email_Message_Object and the Win_Task_Object (which depends on the Email_Message_Object) were bumped to 2.0.1.
Made the usage of @rate, @units, and @scale on FrequencyType optional, closes #40

It is now possible to use @trend as it was intended, without the use of @rate, @units, or @scale
Fixed a typo in cyboxCore:Defined_Effect, closes #67
Fixed a typo in cyboxCommon:MeasureSourceType/@name, closes #68
Fixes a typo in cyboxCore:PropertiesType/Property, closes #69
Added an optional cybox_update_version attribute to cyboxCore:ObservablesType, closes #89

This attribute is optional only because not all releases have an update number. Users of releases with an update number MUST use it in order to denote which update release they conform to.
Updated the annotations for *ObjectPropertyType to specify the correct delimiter, closes #90
Fixed the version attributes for the SocketAddressObject, address #46

This will need to be fixed in the build script as well
Fixes a typo in the EventTypeVocab-1.0 by creating a new EventTypeVocab-1.0.1 and deprecating the old version, closes #63

The typo: Anomoly Events should be Anomaly Events. Also updated references to the vocab in documentation.
Updated the version number on all CybOX schemas to the update release
Probably makes more sense to use <deprecated> than <xs:deprecated> to denote deprecated elements
Updated the URL to the CybOX vocabularies file in documentation
Updated the examples to conform with CybOX 2.0.1
Addressing annotation inconsistencies
Merge pull request #93 from CybOXProject/version_2.0.1

Merging version_2.0.1 branch into master.