remove old style catches from the library

This removes the old style catches and replaces them with
try/catch. It seems to make the code much clearer and its certainly
less failure prone.

src/ec_file.erl

@@ -97,13 +97,14 @@ remove(Path) ->
 %% @doc indicates witha boolean if the path supplied refers to symlink.
 -spec is_symlink(path()) -> boolean().
 is_symlink(Path) ->
-    case catch file:read_link_info(Path) of
+    case file:read_link_info(Path) of
 	{ok, #file_info{type = symlink}} ->
 	    true;
 	_ ->
 	    false
     end.
 
+
 %% @doc make a unique temorory directory. Similar function to BSD stdlib
 %% function of the same name.
 -spec mkdtemp() -> TmpDirPath::path().

src/ec_semver.erl

@@ -88,10 +88,10 @@ compare_toks2(_ToksA, _ToksB) ->
 
 -spec to_int(string()) -> integer().
 to_int(String) ->
-    case catch list_to_integer(String) of
-        Integer when is_integer(Integer) ->
-	    Integer;
-        _ ->
+    try
+	list_to_integer(String)
+    catch
+	error:badarg ->
 	    throw(invalid_semver_string)
     end.