Add support for Source Map Revision 3.

Makefile

@@ -9,10 +9,10 @@ SASS_SASSC_PATH ?= sassc
 SASS_SPEC_PATH ?= sass-spec
 SASSC_BIN = $(SASS_SASSC_PATH)/bin/sassc
 
-SOURCES = ast.cpp bind.cpp constants.cpp context.cpp contextualize.cpp \
+SOURCES = ast.cpp base64vlq.cpp bind.cpp constants.cpp context.cpp contextualize.cpp \
 	copy_c_str.cpp error_handling.cpp eval.cpp expand.cpp extend.cpp file.cpp \
 	functions.cpp inspect.cpp output_compressed.cpp output_nested.cpp \
-	parser.cpp prelexer.cpp sass.cpp sass_interface.cpp to_c.cpp to_string.cpp \
+	parser.cpp prelexer.cpp sass.cpp sass_interface.cpp source_map.cpp to_c.cpp to_string.cpp \
 	units.cpp
 
 OBJECTS = $(SOURCES:.cpp=.o)

Makefile.am

@@ -1,10 +1,10 @@
 ACLOCAL_AMFLAGS = -I m4
 
 lib_LTLIBRARIES = libsass.la
-libsass_la_SOURCES = ast.cpp bind.cpp constants.cpp context.cpp contextualize.cpp \
+libsass_la_SOURCES = ast.cpp base64vlq.cpp bind.cpp constants.cpp context.cpp contextualize.cpp \
   copy_c_str.cpp error_handling.cpp eval.cpp expand.cpp extend.cpp file.cpp \
   functions.cpp inspect.cpp output_compressed.cpp output_nested.cpp \
-  parser.cpp prelexer.cpp sass.cpp sass_interface.cpp to_c.cpp to_string.cpp \
+  parser.cpp prelexer.cpp sass.cpp sass_interface.cpp source_map.cpp to_c.cpp to_string.cpp \
   units.cpp
 libsass_la_LDFLAGS = -no-undefined -version-info 0:0:0
 

ast.cpp

@@ -24,7 +24,7 @@ namespace Sass {
   {
     if (!tail()) return 0;
     if (!head()) return tail()->context(ctx);
-    return new (ctx.mem) Complex_Selector(path(), line(), combinator(), head(), tail()->context(ctx));
+    return new (ctx.mem) Complex_Selector(path(), position(), combinator(), head(), tail()->context(ctx));
   }
 
   Complex_Selector* Complex_Selector::innermost()