Log Message:
libsass: updated to 3.5.0

3.5.0:
Features
Implement trailing commas in parameters and arguments
Implement deprecation warning for ID strings that look like colors
Implement content-exists function
Implement support for passing var() to CSS functions
Implement first class functions
Implement nesting guard to avoid "out of stack space"
Implement exponents for numbers
Implement long file path support for Windows
Implement case modifier for attribute selector
Implement warning for double parent selectors
Implement support for custom property syntax
Implement support for custom-property feature flag

Optimisations
Performance improvements
Fix memory leak by removing previously unused code
Fix memory leak of custom functions signature

Community
Add libsass-python to Readme
Update link to go-libsass

Fixes
Fix media query stack and eval issue
Fix Attribute Selector equal compare operator
Fix segfault for varargs with non-string keys
Fix Element Selector compare operators
Fix compiler issue with spec regression on NetBSD 6.1
Fix some segfaults caused by the parser being too forgiving
Fix segfault with invalid map keys
Fix null pointer dereference in css_error
Fix bug when parsing selector schemas
Fix null pointer dereference when parsing selector schemas
Fix .editorconfig
Fix compiler issue with spec regression on NetBSD 6.1
Fix segfault when extending pseudo selectors failed
Fix parser for urls looking like ruleset selectors
Fix use of non-portable std::to_string
Fix use of non-portable strdup
Fix unary slash expressions
Fix missing error for trailing comma in selector list
Fix selector and binominal look ahead
Fix hex escape handling in interpolation
Fix wrong parsing of calc functions as number units
Fix incorrect comment evaluation for compressed output
Fix parent selector handling in selector schema
Fix parameter vararg and keyword handling
Fix a few minor memory leaks
Fix issue with invalid error indicator
Fix selector parsing and url regression
Fix null ptr segv on invalid vararg
Fix segfault in selector extend edge-case
Fix segfault in selector extend edge-case
Fix segfault in selector append edge-case
Fix ref-counted value handling in if function
Fix segfault in at-root cssize edge-case
Fix file content malloc to avoid reading beyond buffer
Fix case-sensitive lookup to named color map
Fix shebang for tap-driver
Fix segfault in parser edge case
Fix memory corruption on error in parse_selector_schema
Fix autoconf path for sassc tester
Fix output of invisible @support blocks
Fix to_value for bracketed lists
Fix propagation of named rest arguments
Fix @extend of wrapped selectors
Fix wrapped pseudo selector handling
Fix minor issue with attribute selector unification
Fix issue when passing restargs to call
Fix compressing of colors in selectors
Fix missing error on selector with invalid quote mark
Fix travis-ci mac OSX builds
Fix endless loop comparing Selector_List to List
Fix SmartOS/Solaris build regression
Fix to connect parent selector only once
Fix whitespace issue for wrapped selectors
Fix missing error if cwd goes missing
Fix missing error when mixin ruleset in root has parent selector
Fix sourcemap crutch once again
Fix parser state column following static values
Fix error indicator not being Unicode aware
Fix error sourcemaps not being fully Unicode aware
Fix some compiler warnings
Fix math with multiple units
Fix css test for interpolated numbers
Fix null pointer access in nesting check
Fix @else possibly producing invalid output
Fix parsing of @supports declarations