Provide a plugin hook for when build steps finish

Fixes #318.

src/lib/Hydra/Helper/AddBuilds.pm

@@ -16,7 +16,6 @@ use File::Path;
 use File::Temp;
 use File::Spec;
 use File::Slurp;
-use Hydra::Helper::PluginHooks;
 use Hydra::Helper::CatalystUtils;
 
 our @ISA = qw(Exporter);

src/lib/Hydra/Helper/PluginHooks.pm

@@ -1,35 +0,0 @@
-package Hydra::Helper::PluginHooks;
-
-use strict;
-use Exporter;
-
-our @ISA = qw(Exporter);
-our @EXPORT = qw(
-    notifyBuildStarted
-    notifyBuildFinished);
-
-sub notifyBuildStarted {
-    my ($plugins, $build) = @_;
-    foreach my $plugin (@{$plugins}) {
-        eval {
-            $plugin->buildStarted($build);
-        };
-        if ($@) {
-            print STDERR "$plugin->buildStarted: $@\n";
-        }
-    }
-}
-
-sub notifyBuildFinished {
-    my ($plugins, $build, $dependents) = @_;
-    foreach my $plugin (@{$plugins}) {
-        eval {
-            $plugin->buildFinished($build, $dependents);
-        };
-        if ($@) {
-            print STDERR "$plugin->buildFinished: $@\n";
-        }
-    }
-}
-
-1;