Updated the installation and usage instructions
Updated the installation and usage instructions

- expands on existing instructions for added clarity to new users
- informs user where to run the generator
- removed "$" from bash commands to make copy/paste easier
- Fixes #31

cfarm/generator-cf,mistergone/generator-cf,jimmynotjim/generator-cf,anselmbradford/generator-cf,cfarm/generator-cf,anselmbradford/generator-cf,mistergone/generator-cf,Scotchester/generator-cf,anselmbradford/generator-cf,contolini/generator-cf,jimmynotjim/generator-cf,Scotchester/generator-cf,contolini/generator-cf,contolini/generator-cf,jimmynotjim/generator-cf,jimmynotjim/generator-cf,Scotchester/generator-cf,mistergone/generator-cf,cfarm/generator-cf