0.2.0

Features

• Update Go toolchain from 1.7.0 to 1.7.1 -- #93
• Add new repository rules, go_repository and new_go_repository -- #84
• Several enhancements of Gazelle -- #83, #95, #96, #102, #107
• Support execroot-relative include paths in cgo command line -- #99

Bug fixes

• Build failure of cgo targets on OSX with Bazel HEAD -- #86
• /bin/bash: Argument list too long(#42) -- fixed by #83
• Avoid unnecessary re-download of go toolchains -- #85
• Link failure of cgo targets depending on a cc_library rule which requires linkopts -- #103

Misc

• #100
• #112