Load new deps to pod

[Deraen]

Cljs task could check if dependencies have changed since last run and load new deps. This should allow adding new deps using set-env! using them from Cljs without restarting Boot.

[azizzaeny]

@Deraen, cool...

If project dependencies have changed, add new dependencies to Boot-cljs pods (#95)
E.g.

(boot.core/set-env! :dependencies #(conj % '[com.andrewmcveigh/cljs-time "0.4.0"]))

can be used to add cljs-time dependency and Boot-cljs will find this without restarting the whole Boot process.

can you publish the snapshots version...