Merge pull request #28 from centic9/README_Update

Small README update
Thanks for catching this @centic9.
1. fix Tag comparing issue. 2. fix ondemand alert email issue
Merge branch 'master' of https://github.com/Netflix/ice
1. fix colume plot issue. 2. add option to show graph only on UI. 3. fix cost by resource groups calculation issue. 4. fix monthly cost issue for some usages
fix the layout issue for graph only mode.
added initial .gitignore