Better GUI options

Set better GUI options in vimrc (for gvim and others).
Add xterm-color-table plugin

Adding useful xterm-color-table plugin.
(https://github.com/guns/xterm-color-table.vim)
Update submodule references

Updated references to:
                    syntastic
                    tagbar
                    vim-bundler
                    vim-fugitive
                    vim-haml
                    vim-rails
                    vim-snipmate
                    vim-snippets
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