While Go will assign the correct type to a const block when it
auto-creates the values, assigning makes the const be typeless and will
only gain it in each particular use.
Make each constant in the blocks have an assigned type.
The option to ignore the server's certificate has been removed, replaced
witha callback for the user to perform their own checking.
Remote.Fetch() now performs opportunistic updates and takes a list of
refspecs to use as the active set for a particular fetch.
Carlos Martín Nieto
David Calavera
Jesse Ezell