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Removing say() function in perl plugin so that it doesn't overwrite OSX comand line utility. Closes #2562

Allow ctrl-h, ctrl-?, ctrl-w after changes in normal mode.

Allow ctrl-p, ctrl-n for history navigation while in insert mode.

* Easy to remember aliases
* Simplified
* Added aar() function for `sudo apt-add-repository xxxx && apt-get upgrade && apt-get install xxxx`

This is a bunch of alias for the JHBuild tool.
A well known tool in the GNOME dev project.

This is done by calling `_task` at the end of the _task completion file,
as is standard in completion files.

docker container autocomplete listing uses containers ID instead of names.
Most users identify their containers by name. ID is only needed and used on a dynamic environment more suited in scripts.

Ubuntu and Debian store the system-installed virtualenvwrapper in
/etc/bash_completion.d/virtualenvwrapper, so that it gets automatically sourced
at startup in Bash. By not putting it somewhere in $PATH, they end up excluding
others (e.g. Zsh) that might want to use that file. Oops!

The virtualenvwrapper plugin should account for this so that Ubuntu (or Debian)
users don't end up with this message:

zsh virtualenvwrapper plugin: Cannot find virtualenvwrapper.sh. Please install with `pip install virtualenvwrapper`.

even when they have a virtualenvwrapper installed to a known location.

This is because we can't be sure which arguments require a json file
and which don't, so the `else' statement will always be difficult to
check for correctness.

Use $_comp_command1 for command list generation instead of 'composer':

  `$_comp_command1` contains the command written in the command line.
  This allows us to have a different composer name

They are implemented in lib anyway.

Sources the activate.sh file or informs the user, that its not
available.
Overriding the cd function, as it was formerly done, is not needed
anymore, activate.sh does this by itself.

This way the user can keep their preferred pushd syntax while enabling
us to use a standard syntax in our defined functions.

To explain further, without a clear value on the PUSHD_MINUS option, we
could be changing the +1/-0 values all we want, that some user would
find that it didn't work for him.

We have two options, then:
- Setting a particular value, which was my first approach.
- Using `emulate -L zsh` to ensure all options defined in the function's
  body won't be passed along to the main zsh instance.
  For more info see:
  http://zsh.sourceforge.net/Doc/Release/Shell-Builtin-Commands.html#index-emulate