Fixes and improvements for postgresql#3

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carlopires wants to merge 15 commits intogpongelli:postgresql_v2from

carlopires:postgresql_v2

Commits on Apr 8, 2012

Better support to boolean and numeric types to postgresql driver
carlopires
committed

Commits on Apr 10, 2012

Commits on Apr 11, 2012

Fixed installation sql for modules table
carlopires
committed

Commits on Apr 16, 2012

More fixes to module installation with postgresql driver
carlopires
committed

Commits on Apr 17, 2012

Revert to use $row->extension_id in component adapter installer due to missing $key variable error
carlopires
committed

Commits on May 4, 2012

Merge remote branch 'upstream/postgresql_v2' into postgresql_v2
carlopires
committed

Commits on Jun 12, 2012

Fixed JDatabasePostgreSQL::sqlValue and SQL script
carlopires
committed