(feat) #1 Add support for database schema setting

nfldb should be installable in a non-public schema if desired,
this commit sets the search_path for the cursor so that all queries
will be against the desired DB schema first and public second

Squashed commits:
(feat) #2 Add support for database schema setting to config file
(feat) closes #3
(feat) #1 add a _PFX_ replacement mechanism for DDL
Simple string replacement on all DDL in the db module to allow for explicit
resource references in DDL updates
(fix) #1 correct use of new conn tuple
(fix) #1 bad call of pfx fixed
(fix) #1 spaces do help
Merge branch 'master' of github.com:leonardb/nfldb