add supertab plugin and vim-system-copy plugin

sources_forked/vim-system-copy/README.md

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+System Copy
+===========
+
+System copy provides vim mappings for copying / pasting text to the os specific
+clipboard.  Most people will be happy just setting their Vim clipboard to the
+system clipboard, but I find that doing so pollutes my clipboard history.
+Instead, this plugin creates a unique mapping that explicitly pulls content
+from Vim into the system clipboard.
+
+Usage
+-----
+
+System copy provides a mapping to copy to the system clipboard using a motion
+or visual selection. It also provides a mapping for pasting from the system
+clipboard.
+
+The default mapping is `cp`, and can be followed by any motion or text
+object. For instance:
+
+- `cpiw` => copy word into system clipboard
+- `cpi'` => copy inside single quotes to system clipboard
+
+In addition, `cP` is mapped to copy the current line directly.
+
+The sequence `cv` is mapped to paste the content of system clipboard to the
+next line.
+
+Clipboard Utilities
+-------------------
+
+ - OSX     - `pbcopy` and `pbpaste`
+ - Windows - `clip` and `paste`
+ - Linux   - `xsel`
+
+Options
+-------
+
+`system-copy` uses default copy and paste command based on your OS, but
+you can override either of these commands if you have more specific needs.
+
+To declare custom copy command use following example:
+``` vim
+let g:system_copy#copy_command='xclip -sel clipboard'
+```
+And to declare custom paste command use:
+``` vim
+let g:system_copy#paste_command='xclip -sel clipboard -o'
+```
+
+Installation
+------------
+
+If you don't have a preferred installation method, I recommend using [Vundle](https://github.com/VundleVim/Vundle.vim).
+Assuming you have Vundle installed and configured, the following steps will
+install the plugin:
+
+Add the following line to your `~/.vimrc` and then run `:PluginInstall` from
+within Vim:
+
+``` vim
+call vundle#begin()
+" ...
+Plugin 'christoomey/vim-system-copy'
+" ...
+call vundle#end()
+```