Bugsy

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* remove unused imports
* If we get an error when searching throw a search exception and pass through the error from Bugzilla
* add text property to Comment class
* add id property to Comment class
* Make contributing docs more thorough around creating a virtualenv and testing
* Allow authenticating to Bugzilla with a userid and cookie.
* When updating a bug that already exists we should use PUT not POST

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* Add in the ability to use change history fields for searchings
* allow searching to handle time frames
* Change UserAgent for bugsy to that Bugzilla knows that it is us calling. Fixes 4
* Add version added to comments documentation
* Add documenation for comments

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* Updated Documentation
* Fix adding comments to bugs that already exist. Fixes 2
* Give the ability to search for multiple bugs which allows changing the fields returned
* Only request a small number of fields from Bugzilla. Fixes 3
* Initial Comments API design

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* Added the ability to search Bugzilla
* Set include_fields to have defaults as used in Bugs object
* Add the ability to search whiteboard
* Add the ability to search summary fields
* Add in the ability to search for bugs assigned to people

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* Initial implementation