Merge pull request #1 from myahmad/master

Added some utility methods in Util.
Add multi-column index support
Merge pull request #2 from kestefanie/HEAD

Add multi-column index support
fixed bugs for createIndex, deleteIndex, executeIndex for multiColumn
indexing
Merge branch 'master' of https://github.com/kestefanie/0.96-index-commons-inmem.git
Interface definition and major refactoring.
Interface definition and major refactoring.