Fixed oudated rebar.config dependencies.

Replaced:

{deps, [
 {lager,  "2.0.0", {git, "git@github.com:basho/lager.git",   "master"}},
 {eper,   "0.60",  {git, "git@github.com:mhald/eper.git",      "HEAD"}}
]}.

With:

{deps, [
 {lager,  "2.0.3", {git, "git://github.com/basho/lager.git",   "master"}},
  {eper,   "0.69",  {git, "git://github.com/mhald/eper.git",      "HEAD"}}
]}.