Merge pull request #1 from myahmad/master

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