Ensure elements of less-css-lessc-options are quoted

Compile in *less-css-compilation*, and only show on error

Closes #20

Mark certain variables as safe for buffer-local usage

Add documentation for less-css-input-file-name option

See #16

Use smie indentation from css-mode in latest Emacs HEAD

Don't complain about css-mode in latest Emacs HEAD

Fix error regex

Use --no-color lessc flag by default, which assumes use of lessc >= 1.4

Remove unreliable flymake support

Flymake code has moved to flymake-less. (See #13)

Declare indent-line function after syntax table is defined

Fixes byte-compilation warning.