Moved Gacela to \Gacela\Gacela

Updates for Model and Mapper base classes
Working on moving Gacela and on removing Gacela as an injected
dependency
Fixed a bunch of errors only to find more. Now I don't know where the
current one is.
Got the fatal errors all fixed. Now fixing final errors
Fixes for unit tests. Added phpunit.xml to simplify running tests. For
some reason the cache tests aren't working.
Fixes for unit tests, caching
Adding composer support
Changed vendor name in composer to energylab
Updated Gacela so that find, findAll, criteria, collection are all
instance methods that can be called with a Mapper Name param as
necessary to simplify object access
Fix for Gacela error on dev branch
More fixes for the changes to the Gacela\Gacela class
Merge branch 'master' of github.com:energylab/gacela into develop
All tests pass again, with merged changes from master
Updates up to Configuration
Done up through registering namespaces
Moved doc file to README.md
Tables should render correctly in github
Docs updated through Configuration - enable cache is done.

Basic usage is demonstrated as well as the basic files required.
More work on the README
Readme changes