Modify chefignore to ignore more files by default (basically made it the same as the file that is automatically generated by the starter kit found at 'https://preview.opscode.com/organizations'
Added an initial knife.rb and SAMPLE.knife.local.rb...  Basically set all of the defaults and add comments for other more common options...

knife.local.rb based on suggestion from: http://jtimberman.housepub.org/blog/2013/02/01/local-only-knife-configuration
Ignore knife.local.rb with git and add additional comments about ignoring files in the SAMPLE config file
Add some additional helpful comments
Fix copy/paste mistake
additional comment/suggestion
Added the current_dir variable to the local config file as well... I'm sure it's probably possible to make the variable in knife.rb global; however, I think it might be a good idea to leave here anyway in case a company/user chooses to move this file to a different location (maybe an encrypted partition or something)