Merge pull request #1 from burtbeckwith/master

cleanup
Adding documentation about plugin

Include info about its uses and features
Include code for dropbox authentication and get account info by access token code
Merge branch 'master' of github.com:hitenpratap/DropBox-GrailsPlugin
Changes in get appKey and appSecret property from user's config.groovy
Changes in plugin name to remove conflict
Include other necessary files to code
Added codes for file upload and retrieve metadata info about file/folder(s)
Added codes for file operations like create,move,delete and copy
Updates like use bytes array instead of String path
version change
version change
deleted unused files
cleanup