refactor the naming within plugin new generator

Having a method called `full?`, which checks on :full and :mountable
is very confusing. I renamed `full?` to `engine?` and created a `full?`
method that only checks the `:full` option
change spy of  after invoked controller action. because ruby-2.0.0 waned unused variables
Add rake default to description
Add rake test description
reminder to run bundle after setting up rails-dev-box
removed TIP: :allow_nil/:allow_blank is ignored by the presence validator
These tips were documenting an inconsistency issue https://github.com/rails/rails/issues/8621. That issue is resolved by https://github.com/rails/rails/issues/8622.
rewrite order dependent test case. #8185

As reported (https://github.com/rails/rails/pull/8185#issuecomment-11702226)
this test relied on the order a hash was serialized. Comparing the parsed
hash makes the test no longer order dependent.
Fixed couple of typos
Merge pull request #8634 from senny/rewrite_order_dependent_test_case

rewrite order dependent test case
Consistent punctuation for @jaroslawr :bowtie:
Introduce assert_not to replace 'assert !foo'
Remove 'assigned but unused variable' warning
Merge pull request #8641 from arunagw/warning_removed_unused_var

Remove 'assigned but unused variable' warning
Revert "reminder to run bundle after setting up rails-dev-box"

This reverts commit 41381c19d1f3920ee9540aff0d35209cb43fb057.

Reason: This doesn't quite fit the flow where it's added. Let's add this
someplace else if it's explicitly required.

[ci skip]
Revert "Add rake default to description"

This reverts commit 0d8ca8124de9b3a5f6398a28d79baca935a1f96c.

Reason: docrails isn't the place to do this. Also, I feel this is
not really required.

[ci skip]
Revert "Add rake test description"

This reverts commit a3309caf338830849acd826bc6ad14f972e787db.

Reason: docrails isn't the place to do this.

[ci skip]
Merge branch 'master' of github.com:lifo/docrails
Revert "Detect rbenv and update the shebang"

This reverts commit 7173c4f931c9026bd3bc0b644d93dae744433f09.
This reverts commit a562f9fa09967eba26dff1c3bc8aa85b6f0a72ff.
Revert "Install binstubs by default"

This reverts commit f34c27a452418d8aa17f92bb0fd7ae97b5f7e252.

We'll be taking a different tack on this with new `bundle binstubs <gem>` support.
work off FIXME comments in AR rename_column_test.rb

There were a couple of tests, which had FIXME comments in palce of
assertions. I replaced these FIXME comments with actual assertions to
get more feedback from our test suite.