lazy decoding of CM_Params.
Check CM_Params->decode flag before getAll.
Rename _params to _paramsDecoded, _paramsOriginal->_paramsEncoded. Keep sync between _paramsEncoded and _paramsDecoded through the CM_Params class.
CM_Params: merge _paramsEncoded and _paramsDecoded into _params.
Add new tests for decode and encode of CM_Params.
Merge branch 'master' of github.com:cargomedia/cm into issue-475

Conflicts:
	tests/helpers/CMTest/library/CMTest/TestCase.php
Update decode/encode tests of ParamsTest.
Update getParamsDecoded/getParamsEncoded tests of ParamsTest.
Adjust decode flag in CM_Params::factory.
Restore changes of b153f29 with adjustment of CM_Params.
Merge pull request #1378 from vogdb/issue-475

lazy decoding of CM_Params.