Use configPath to locate the configuration file, instead of assuming a fixed path

[charlespierce]

Info

The compatAdapter for ember-get-config currently assumes that the configuration file is always in config/environment.js. However, it is possible to change the config directory with a setting in package.json. If that is done, the compat adapter will fail when it tries to require a file that doesn't exist.

Changes

• Updated V1App to provide access to Ember's method of locating the environment file.
• Updated the ember-get-config adapter to use the above, instead of assuming that it's always at config/environment.js

[ef4]

Thanks.