expanded rdoc on source_reflection method
Removed unused comma after loop variable
Replaced inject with map
Merge pull request #10088 from neerajdotname/fixes1

minor fixes including variable name change and expanded rdoc
Merge pull request #10076 from choudhuryanupam/master

Removed unused comma after loop variable
Further simplify enumerable group_by test
Basic Layouts overview w/ link to guide
Add Action View Overview to guides listing.
Update Ryan Bigg's occupation and credentials.
fix private attribute warning
Fixes skipping object callback filters

This allows you to skip callbacks that are defined by objects, e.g. for
`ActionController`:

    skip_after_filter MySpecialFilter

Previously this didn't work due to a bug in how Rails compared callbacks
in `Callback#matches?`. When a callback is compiled, if it's an object
filter (i.e. not a method, proc, etc.), `Callback` now defines a method on
`@klass` that is derived from the class name rather than `@callback_id`.
So, when `skip_callback` tries to find the appropriate callback to
remove, `Callback` can regenerate the method name for the filter
object and return the correct value for `Callback#matches?`.
Merge pull request #10090 from vipulnsward/fix_private_warn

fix private attribute warning
Model generator USAGE doc improved

 * Added information about syntax for precision/scale of decimals
 * Removed incorrect information about being able to set `default`
 * Added more examples of usage
has_many through obeys order on through association

fixes #10016
Merge pull request #10087 from neerajdotname/10016

has_many through obeys order on through association
expanded rdoc for chain and reflection_names
Merge pull request #10034 from benofsky/fix_skipping_object_callback_filters

Fixes skipping object callback filters
stop depending on callbacks
Revert "Merge pull request #10034 from benofsky/fix_skipping_object_callback_filters"

This reverts commit c79c6980647eb76bfa52178711fb04ba7e9d403b, reversing
changes made to ba4c27479add60b783a0e623c8a5d176c1dc9043.

This broke all the tests. See https://travis-ci.org/rails/rails/builds/6061839
mark ActionView::Helpers::Tags as :nodoc: [ci skip]