Merge pull request #1 from prabinb/master

Added modal for creating and editing indexes
fixed prettyPrint functionality for join using index lookup and index scan
fixed prettyPrint functionality for join using index lookup and index scan
Merge pull request #2 from prabinb/master

Preserving the order of columns while creating multiple indexes, Making Btree as the default index type and fixed other minor bugs
modified App.js to support types like index scan,unique index lookup,index range scan
refactored the code
changed PrettyPrint functionality in App.js to support when children type is Index Scan
Merge pull request #4 from vineelal/master

added pretty print support for index scan, unique index lookup and index range scan
Changed prettyPrint functionality in App.js to excluding displaying bookmark lookup
Merge pull request #5 from vineelal/master

updated pretty print to exclude bookmark lookup from the tree view
displaying "using index" instead of "using index lookup" and "using unique index lookup"