Set a stream context timeout for file reading

Add a context array to all instances of file_get_contents(). This is so
we don't end up with a timeout too early if the system is set to
something short (ie, 15 secs) and we try to open a large file that takes
longer than this short limit.
RGB color value added to picker

Farbtastic color picker now setting RGB value and BG color in colorRGB
elem
insertColorValue function adjusted to receive any value and replace
RGB background, color and value set

Same BG and color as hex elem, but value is set the hex BG value with
whitespace removed
New classes for colorValue and insertColorValue

To stop using inline styles on the preview/value boxes and insert
buttons