Configurable dist

[sdoxsee]

I've often needed to use a custom "dist' directory in the Grunt. This allows one to change dist to any directory they want by changing the appConfig.dist variable. This is similar to #9 but should be a clean merge for the current state of the generator.

[joeljeske]

+1 for build step configuration ability, even beyond just the output directory location. I would like to be able to configure the following

• Output directory name
• Output .js filename
• Output .css filename
• Bower libraries location. This is configurable using .bowerrc already but it will break grunt/gulp if changed. I suggest grunt/gulp reading this file to determine the folder name

I would also suggest creating a config file for build steps as to not duplicate configuration between gulp or grunt.