Merge pull request #17 from PiTiLeZarD/master

primary_key in db from sources
mETL 0.1.7.0 Major changes and running time reduction.
Merge branch 'master' of https://github.com/ceumicrodata/mETL
mETL 0.1.7.0 Primary Key setting
mETL 0.1.7 mETL Primary key fix
mETL 0.1.7.0 PostgreSQL and Psycopg2 alternate method fix to quote unique values.
Added type conversion when skipRows and headerRow attribute was string.
fix