Use --rc= instead of --rc
Merge pull request #9174 from robertomiranda/railsrc-cli-option

Use --rc=PATH instead of --rc PATH
Add --rc description on the command line
Merge pull request #9175 from robertomiranda/add--rc-desc

Add --rc description on the command line
Added test:all and test:all:db tasks to speed up full test runs.

Speed up depends on the number of test phases (N) you have for your
app, but it is roughly a 1/N improvement. In my app, it goes from
15.51s to 5.56s.

Inspired by http://ngauthier.com/2012/02/quick-tests-with-bash.html

Reviewed by @tenderlove
Merge pull request #9177 from zenspider/master

Added test:all and test:all:db tasks to speed up full test runs
Update upgrading guide with ActionDispatch::BestStandardsSupport removal
Merge pull request #9178 from robertomiranda/best-standard-support-guide

Update upgrading guide with ActionDispatch::BestStandardsSupport removal [ci skip]
Ignore .ruby-version
Merge pull request #9192 from adammck/ignore-dot-ruby-version

Ignore .ruby-version
Enable hstore extensions on tests if it is not enabled and database supports it
Update .gitignore

Get rid of old .rvmrc and .rbenv-version files.