Issue with list-migrations function.

[Manoj Waikar]

When you start the REPL for lobos, and if you try to run list-migrations function, it returns nil.

Now write a few commands and dump them (so that the migrations.clj file gets generated), then if we try to run list-migrations (after creating the necessary config.clj file) the following exceptions is thrown -

java.lang.String cannot be cast to clojure.lang.IObj
  [Thrown class java.lang.ClassCastException]

Restarts:
 0: [QUIT] Quit to the SLIME top level

Backtrace:
  0: clojure.core$with_meta.invoke(core.clj:192)
  1: clojure.contrib.def$name_with_attributes.invoke(def.clj:119)
  2: lobos.migration$defmigration.doInvoke(migration.clj:104)
  3: clojure.lang.RestFn.invoke(RestFn.java:495)
  4: clojure.lang.Var.invoke(Var.java:381)
  5: clojure.lang.AFn.applyToHelper(AFn.java:180)
  6: clojure.lang.Var.applyTo(Var.java:482)
  7: clojure.lang.Compiler.macroexpand1(Compiler.java:5286)
  8: clojure.lang.Compiler.macroexpand(Compiler.java:5341)
  9: clojure.lang.Compiler.eval(Compiler.java:5409)
 10: clojure.lang.Compiler.load(Compiler.java:5857)
      [No Locals]
 11: clojure.lang.RT.loadResourceScript(RT.java:340)
 12: clojure.lang.RT.loadResourceScript(RT.java:331)
 13: clojure.lang.RT.load(RT.java:409)
 14: clojure.lang.RT.load(RT.java:381)
 15: clojure.core$load$fn__4511.invoke(core.clj:4905)
 16: clojure.core$load.doInvoke(core.clj:4904)
 17: clojure.lang.RestFn.invoke(RestFn.java:409)
 18: clojure.core$load_one.invoke(core.clj:4729)
 19: clojure.core$load_lib.doInvoke(core.clj:4766)
 20: clojure.lang.RestFn.applyTo(RestFn.java:143)
 21: clojure.core$apply.invoke(core.clj:542)
 22: clojure.core$load_libs.doInvoke(core.clj:4800)
 23: clojure.lang.RestFn.applyTo(RestFn.java:138)
 24: clojure.core$apply.invoke(core.clj:544)
 25: clojure.core$use.doInvoke(core.clj:4880)
 26: clojure.lang.RestFn.invoke(RestFn.java:422)
 27: lobos.migration$list_migrations.invoke(migration.clj:168)