0.3.5

• Add rust::Str and rust::String constructors taking const char * + size_t (#242)
• Add rust::Vec accessors: operator[], at, front, back (#257, thanks @rinon)
• Fix no matching function for call to 'operator new' error (#238)
• Support controlling shared object symbol visibility (#231, #219, thanks @adetaylor)
• Prevent duplicate definitions if generated .cc were to include generated .h via intermediate includes (#247, thanks @adetaylor)
• Fix ineffective use of #pragma once (#246)
• Cut 7 dependencies from cxxbridge-cmd (#245)
• Fix noncompilable code generated for arguments of type &mut Vec<T> (#263)