basic generalized API for GoToDefinition
support GoToDefinition on variables

basic search support for variables (may not work with function
variables)
support goto for mixin reference
support goto for user function
support going to specific file and line
special case for stylesheet

jumping to line would put us at bottom of document.
get goto definition finished

support mixin / function variable definition lookup and same document
matches
0.8.8.7

go to definition release
goto parent

support goto definition on parent reference selector
update to latest version of libsass

closes #52
closes #50
bump to v0.8.8.8

.8.8.8.8.8.8.8
fix bad parsing of url() function

when url() was being used without quotes, it did not handle things very
well
bump version to 0.8.8.9
unused
missed where it was used

was only used for logging, so drop it
update yui compressor
smarter commenting

add // comments at maximal indentation level

closes #55