Remove deprecated insertSnippet() function...  Kittens will cheer!
Make addSnippet() use $this->getName() over $this->namespace
Make addWidget() use $this->getName() over $this->namespace
Remove deprecated function insertWidget()
Make getConfigFiles() use the Bolt config directory for extension config
files
Move extension config file location and loading to
app/config/{ExtensionName}.yml
Remove deprecated getInfo() function
Remove deprecated init() function
Cleanup use of $this->namespace a little
Less of $this->info()
Add an 'extensionsconfig' path parameter to ResourceManager
Push extension configs into a subdir of app/config/
Create app/config/extensions/ and add index.html
R.I.P. info()
Less info()
Merge pull request #1631 from GawainLynch/feature/BaseExtension-cleanup

BaseExtension cleanup