Downgrade grpc to get Go 1.5 compatibility

Closes #85

See merge request !133

Merge branch '83-follow-up-from-handle-gl_repository-env-variable-and-use-it-in-api-calls' into 'master'

Use gl_repository if present when enqueing Sidekiq PostReceive jobs

Closes #83

See merge request !132

Use gitaly-upload-pack and gitaly-receive-pack

Closes gitaly#193

See merge request !129

Handle GL_REPOSITORY env variable and use it in api calls

See merge request !130

Use a shorter socket path during testing

See merge request !131

Use recursive lookup for git repositories in the bin/create-hooks script

Closes #82

See merge request !128

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add hello-world Go executable and gitaly-proto 0.5.0

Closes gitaly#186

See merge request !127

Explain how to release a new version

See merge request !126

adds timeout option to push branches and respective test suite

See merge request !124

Fetch repositories with --quiet option by default

See merge request !125

This will allow us to prevent deadlocks when dealing with extremely
long outputs from `git fetch`. All the pipes (stdin, stdout, and
stderr) have limited buffers, and when one fills up, everything is
going to stop.

Remove git annex support

See merge request !122