describe how to enter DEBUG mode. #142
bump a few out of date version numbers
Merge pull request #144 from gorsuch/version_tweaks

bump a few out of date version numbers
Bump pg version to 0.15.1
Use explict rubygems url in Gemfile
Merge pull request #148 from strzalek/patch-1

Use explict rubygems url in Gemfile
Merge pull request #147 from cschramm/master

Bump pg version to 0.15.1
update changelog for v2.1.4
default `#handle_failure` logs job and error.

Closes #143.
Merge pull request #145 from ryandotsmith/143_log_failures_in_debug_mode

default `#handle_failure` logs job and error.
remove trailing whitespace from queue_test.rb
make QC.default_queue assignable
Merge pull request #146 from ryandotsmith/make_default_queue_configurable

Make QC.default_queue configurable
Use json type for the args column if json is available.

Also add some constraints to the q_name and method columns.