Refactory select.ls

- add paging testcases.
- add query testcases.
Add mk-pgrest-fortest to new pgrest instance in test cases.
Refactory insert.ls.
simplfy select.ls to reduce test time.
change reporter to spec because it is much easy to read test purpose.
refactory upsert.ls.
fix hardcode database connection string in testlib.
use provide-dbconn in upsert.sl to get database connection string
Refactory routes.ls
add cusom schema testcase.
refectory array.ls.
do cleanup action after each test.
Merge branch 'master' into enhance_testcases