Merge pull request #4 from chjwang/master

configure keystone token and project_id
Merge pull request #5 from chjwang/master

table crud
Merge pull request #6 from chjwang/master

delete_item and fixing others
Added support for running sets of tests

Added support for running sets of tests with different configs
Merge pull request #7 from chjwang/master

add update_item
add list_tables, fix benchmark_runner