interfacing with c_functions part 0
Create function list and function, now how to combine them
Compiles but nothing happens
remove args from test
Added a custom function to libsass for setting fn list
get options from created context
DO NOT MERGE TO MASTER!

* Example usage of custom functions
* Requires forked libsass
* Any custom function is replaced with boolean false
Remove useless function
Custom function compiling
Use forked version of libsass
Executing go code from C!
Pass pool lane to C for lookup when back in Go land

* Function definition must be placed in a separate file
* Must append Context to pool for native C lookups
* Custom handler takes a pointer to pool lane int
Code cleanup and more precise use of c-interface
Break option settings into separate function
Pass all sass arguments to Go, custom fn arity test
Check in progress on type casting sass -> go
Tests for SassValue data type parsing
use SassValue enum, and treat the conversion as encoding/decoding
Move sassvalue encoding to separate file, clean up C deps
step 1 unmarshaller