v4.0.0-rc2

Core

• added Blobs, Trees and Objects iterators to Repository #114

Clients

• ssh: fix ssh client #96

Formats

• packp: package advrefs encodes and decodes advertised references messages #92
• packp: package ulreq encodes and decodes upload-request messages #106
• index: added index format support #91 #105
• config: package to encode, decode and manipulate git config files #97

Utils

• binary: new package that collect all the spare helper functions about binary operations #102
• fs: move 'os' and 'test' to separate packages #93
• fs: add Remove() #94
• fs: add OpenFile method to filesystem interface #104
• fs: new memory file system #108