bugfix, when matching multiple paths with `get`, `post`, ...

This problem was introduced with:

https://github.com/rails/rails/commit/d03aa104e069be4e301efa8cefb90a2a785a7bff
routing shorthand syntax works with multiple paths

Closes #9913.

We need to expand the match shorthand syntax for every path.
.gitkeep -> .keep

Mentioned in a comment in e90c2d029edc by @frodsan.
We don't need to remove index.html any more.

Since it's not a real file any longer, no need to worry about
removing it when we reset the dummy.
CHANGELOG entry for rails.png removal.
Getting rid of a few other vestiges of rails.png.

We don't actually need a rails.png in the AP fixtures, the tests
that use it don't actually try to load the file.

We also don't need to get rid of it with the dummy reset either.

Finally, it's not needed in the sample application that's included
with the Rails Guides.
true/false => truthy falsy
Per #9999 revert the revert changing so columns are only tested for empty? as opposed to blank?

This is both faster and more correct, added tests to make sure this is not reverted again.
Merge pull request #10063 from SamSaffron/master

Per #9999 revert blank? to empty?
Fix grammatical error on JS helper warning message

Add changelog entry

Delete changelog
Merge pull request #10064 from thenickcox/fix_grammatical_error

Fix grammatical error on JS helper warning message [ci skip]
Move alias method near to the aliased one in collection proxy
fix regression in Mapper when `format:` was used in a `scope`.

Closes #10071

`#normalize_path!` depends on the options so we need to call
`#normalize_options!` first to make sure everything is set correctly.
Avoid running bundler on tests that don't need it
Remove comments about removing LegacyKeyGenerator in 4.1
Merge pull request #10072 from senny/10071_format_on_scope_block_is_ignored

fix regression in Mapper when `format:` was used in a `scope`.
Merge pull request #10070 from rubys/skip_bundle_in_railties_tests

Avoid running bundler on tests that don't need it
Merge pull request #9932 from senny/9913_routing_problem

routing bugfixes when matching multiple paths
Merge pull request #10074 from trevorturk/remove-fixme-comments-about-legacy-key-generator

Remove comments about removing LegacyKeyGenerator in 4.1
optimize some code around merge