v0.6.0

• Fixed a bug where API usages by dependencies of proc-macros were not properly checked.
• Pass environment variables set by build scripts to sandboxed rustc.
• Allow passing of arbitrary environment variables to sandboxed processes.
• Fixed repeated running of tests when a test failed.
• Fixed cargo acl run (--all-targets was being passed causing it to error).
• Cargo features can now be specified via --features flag.