add datasource option

To be able to connect to another datasource than the default one.
I’m not sure about the `-d` option, sounds like ‘delete’, any idea for
another short option for `datasource` ?
replace datasource with connection
add info for plugin and connection options in readme
Merge pull request #5 from dakota/master

Changes config directory, fix SqlServer driver and add --target option
Fixing casing of Config folder example
ROOT constant does not have a trailing DS
Merge pull request #6 from dakota/patch-1

ROOT constant does not have a trailing DS
Merge branch 'master' of https://github.com/cake17/cakephp-migrations into cake17-master

Conflicts:
	src/Console/Command/MigrationsShell.php
Merge branch 'cake17-master'
Revert to single namespace
Merge pull request #7 from dakota/single-ns

Revert to single namespace
General cleanup and adding some doc blocks
Adding more doc blocks
Adding more doc blocks
Adding some unit tests
Adding more tests
Adding the CakePHP license to all files
Move console/command to shell/