el-get: removed silentcomp, it is quite obsolete

(silentcomp-defun some-function) == (declare-function "ext:library-file.el" some-function)
(silentcomp-defvar some-variable) == (defvar some-variable)
vcs: new magit keybinding
openwith: new bindings
utils: ugly but handy way to copy project subpaths
mingus: delete from playlist keybinding