add recipes pocket-mode

[lujun9972]

Brief summary of what the package does

[Manage your pocket]

Direct link to the package repository

https://github.com/lujun9972/pocket-mode

Your association with the package

I am the maintainer

Relevant communications with the upstream package maintainer

None needed

Checklist

Please confirm with x:

• I've read CONTRIBUTING.md
• I've used package-lint to check for packaging issues, and addressed its feedback
• My elisp byte-compiles cleanly
• M-x checkdoc is happy with my docstrings
• I've built and installed the package using the instructions in the README

[syohex]

• tabulated-list-print can accept only one optional argument on older Emacs(24.4, 24.5). This causes exception in pocket-refresh
• I suppose list-pocket should be pocket-list for package naming convention.

[lujun9972]

• I have removed the second argument of tabulated-list-print
• according to http://www.gnu.org/software/emacs/manual/html_node/elisp/Tabulated-List-Mode.html#Tabulated-List-Mode.

The derived mode should also define a listing command. 
This, not the mode command, is what the user calls (e.g., M-x list-processes). 
The listing command should create or switch to a buffer, turn on the derived mode, specify the tabulated data, and finally call tabulated-list-print to populate the buffer. 

So I think list-pocket is the way following naming convention

[purcell]

pocket-list would still be preferable, please, and will not produce package-lint warnings.

In the meantime, I'll go ahead and merge this, which looks like a handy package!