Restores object count and adds offset/limit attributes to API responses for paginated collections (#6140).

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These attributes are not required for common uses case (eg. updating an object). They can be requested in the reponse using the 'include' parameter. Example GET /issues/1.xml?include=journals. The list of attributes that can be included in responses will be documented in the wiki.

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Select projects with issue_tracking module for gantt display and remove the nil start/due dates trick.

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Adds a pseudo format to api template names and overrides ActionController#default_template so that api templates are chosen automatically.

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Converts IssuesController to use the new API template system and makes xml/json responses consistent (#6136).

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