[#4993 state:committed]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

This reverts commit 234a4ca7.

Reason: No big deal Ryan, only there's a very strict policy in
docrails which allows public write access on the other hand.
CHANGELOGs can only be edited in master. If this is added I'll
make sure you get the credit for the patch.

Updated DOCS for engines and added a couple TODOs. Also, commented internal railties rake tasks description.

I corrected a code snippet typo in the railties/guides/source/initialization.textile file [#5779 state:resolved]

Revert "Make InstanceTagMethods#value_before_type_cast raise if the model don't respond to attr_before_type_cast or attr method"
And    "Makes form_helper use overriden model accessors"

This reverts commit 3ba8e310 and fb0bd8c1.

[#5739 state:committed]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

[#5539 state:committed]

Commit 57144388 removed the hard-coded dependency on the memcache-client
gem, and added this warning advising people to install it if needed. The
problem is, however, that if people follow the advice literally and install
the 'memcache' gem, they will wind up with a completely different thing,
which is not API compatible with the memcache-client gem and which Rails
can't work with.

So, be explicit and tell users to install the 'memcache-client' gem.
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

[#5775 state:resolved]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

This will be used internally by sprockets to ensure requires are executed just once.

This commit moves all the template rendering logic that was hanging around AV::Base to renderer objects.

Signed-off-by: NXavier Noria <fxn@hashref.com>

Before this patch, every request in development caused the template
to be compiled, regardless if it was updated in the filesystem or not.
This patch now checks the timestamp and only compiles it again if
any change was done.

While this probably won't show any difference for current setups,
but it will be useful for asset template handlers (like SASS), as
compiling their templates is slower than ERb, Haml, etc.

Rename rake railties:copy_migrations to rake railties:install:migrations and fix it to work with new copying strategy

The purpose of this change is to allow copying fail on the same names.
Migrations change database and they should be treated with caution,
if 2 migrations are named the same it's much better to skip migration
and allow user decide if it should be copied or not.

This change caused by confusion caused by calling engine
"namespaced". Stuff inside engine can be namespaced for every
engine. This method is not actually namespacing anything, it's
isolating engine within the given namespace.