Remove window sizing logic from gvimrc

Let the window manager handle this
Move vimrc, gvimrc -> .vimrc, .gvimrc
Remove automatic window resizing at startup
Don't highlight search matches by default
Don't show intro message
Drop comments introducing vim and gvim config
Consider hyphens to be part of keywords/identifiers
Drop support for GVim
Stop influencing colorscheme
Changed README to only include Vim (no Gvim)
Remove FIXME about xterm clipboard. Works fine.
Tweak organizing comments
Try to use system clipboard without OS detection
Show more command feedback
Update license year to 2014
Added 'toggle line numbers' key binding: <leader>#
Set leader to ;
Recognize *.md files as Markdown
Only use Y to yank to EOL in normal mode
Expand on key bindings to insert newlines