Move TransformTo support up to the MgRestAdapter, ensuring all derived classes support this feature.
First cut of pagination support. All adapters except MapImage support pagination.

In addition, the "many" template includes the following new variables:
 * $maxPages: Indicates the maximum number of pages. This is -1 for an unbounded result set, otherwise it is the maximum number of pages based on the page size and upper limit defined in restcfg.json
 * $currentPage: Indicates the current "page" of a paginated result set
 * $endOfReader: Indicates whether the reader has reached the end while attempting to reach to the current "page" of data.
Add pagination support for MapImage adapter. Fixes #13