Modify erlang-rrdtool to be compatible with rebar

.gitignore

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+.DS_Store
+*.beam
+*.sw[op]

ebin/rrdtool.app

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+{application,rrdtool,
+             [{description,"Erlang-rrdtool is a simple module to allow rrdtool to be treated like an erlang port via its 'remote control' mode (rrdtool -)."},
+              {vsn,"1"},
+              {registered,[]},
+              {applications,[kernel,stdlib]},
+              {mod,{rrdtool_app,[]}},
+              {env,[]},
+              {modules,[rrdtool,rrdtool_app,rrdtool_sup]}]}.

src/rrdtool.app.src

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+{application, rrdtool,
+ [
+  {description, "Erlang-rrdtool is a simple module to allow rrdtool to be treated like an erlang port via its 'remote control' mode (rrdtool -)."},
+  {vsn, "1"},
+  {registered, []},
+  {applications, [
+                  kernel,
+                  stdlib
+                 ]},
+  {mod, {rrdtool_app, []}},
+  {env, []}
+ ]}.

src/rrdtool_app.erl

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+-module(rrdtool_app).
+
+-behaviour(application).
+
+%% Application callbacks
+-export([start/2, stop/1]).
+
+%% ===================================================================
+%% Application callbacks
+%% ===================================================================
+
+start(_StartType, _StartArgs) ->
+    rrdtool_sup:start_link().
+
+stop(_State) ->
+    ok.

src/rrdtool_sup.erl

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+
+-module(rrdtool_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+%% Helper macro for declaring children of supervisor
+-define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 5000, Type, [I]}).
+
+%% ===================================================================
+%% API functions
+%% ===================================================================
+
+start_link() ->
+    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+
+%% ===================================================================
+%% Supervisor callbacks
+%% ===================================================================
+
+init([]) ->
+    {ok, { {one_for_one, 5, 10}, []} }.
+