chore(Cargo.toml): use deps from nickel-org
chore(Cargo.toml): use deps from nickel-org

This moves all dependencies to be loaded
from nickel-org. This way we have more control
and can act quicker when things need to be
patched upstream.

Fixes #113

Ryman/nickel.rs,tempbottle/nickel.rs,lzpfmh/nickel.rs,derdela/nickel.rs,SimonPersson/nickel.rs,cburgdorf/nickel.rs,ixjf/nickel.rs,nickel-org/nickel.rs,anvie/nickel.rs,Ye-Yong-Chi/nickel.rs,jolhoeft/nickel.rs,nikomatsakis/nickel.rs,Manishearth/nickel.rs,BenKnigge/nickel.rs