readme. move Box methods onto Element. add clearBaseLine and getContent.
add a buffering write function for program.
refactor and clean up program.js.
misc - add a blessed.js file.
add a scrollable option.
misc fixes for radiobutton, textarea, textbox, checkbox.
refactor textbox and textarea render/setValue.
more textbox/textarea refactoring.
make textbox inherit from textarea.
allow text to be obfuscated within child elements during a scroll.
fix scrolling obfuscation for elements with borders.