fix bug 1092208 - Update max file size for demo studio
fix bug 1092208 - move demo upload limits to constance
bug 1092208 - Added a config_lazy utility

to help with parameters that are evaluated at import time.
Merge pull request #2873 from groovecoder/config-demos-max-upload-1092208

fix bug 1092208 - move demo upload limits to constance