Add Decimal scale
updated ext/db/adapter/pdo/postgresql.c
Another attempt to fix Mongo
Removed Z_SET_ISREF_P
Merge pull request #940 from dreamsxin/decimal_scale_1.3.0

Add Decimal scale 1.3.0
Merge pull request #949 from sjinks/travis-bugs

Fix bugs in Travis scripts
Update README.md
Merge remote-tracking branch 'upstream/1.3.0' into valgrind

Conflicts:
	unit-tests/ci/install_prereqs.sh