Changes for conkeror-1.0pre1

http://conkeror.org/BreakingChanges#May_1.2C_2014
Remove "minibuffer.prototype.read_url" overriding

"$select" keyword was added to Conkeror: <https://github.com/retroj/conkeror/commit/c36a3121047632da88a1af5befa58bf2245d3292>.