Upgrade some gems, including vagrant to 1.0.6

Gemfile

@@ -1,4 +1,4 @@
-source :gemcutter
+source 'https://rubygems.org'
 
 gem "jenkins-plugin-runtime", "~> 0.2.3"
 gem "jenkins-plugin", '~> 0.2.0'

Gemfile.lock

@@ -1,13 +1,16 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     archive-tar-minitar (0.5.2)
+    bouncy-castle-java (1.5.0146.1)
     bouncy-castle-java (1.5.0147)
-    childprocess (0.3.9)
+    childprocess (0.3.8)
       ffi (~> 1.0, >= 1.0.11)
+    childprocess (0.3.9)
     diff-lcs (1.1.3)
     erubis (2.7.0)
     ffi (1.4.0-java)
+    i18n (0.6.1)
     i18n (0.6.4)
     jenkins-plugin (0.2.0)
     jenkins-plugin-runtime (0.2.3)
@@ -20,8 +23,11 @@ GEM
       jenkins-war (> 1.427)
       rubyzip
       thor
+    jruby-openssl (0.8.2)
+      bouncy-castle-java (>= 1.5.0146.1)
     jruby-openssl (0.8.5)
       bouncy-castle-java (>= 1.5.0147)
+    json (1.5.5-java)
     json (1.7.7-java)
     lockfile (2.1.0)
     log4r (1.1.10)
@@ -40,15 +46,17 @@ GEM
     rubyzip (0.9.9)
     slop (3.0.4)
     thor (0.16.0)
-    vagrant (1.0.7)
+    vagrant (1.0.6)
       archive-tar-minitar (= 0.5.2)
       childprocess (~> 0.3.1)
       erubis (~> 2.7.0)
       i18n (~> 0.6.0)
       json (>= 1.5.1, < 1.8.0)
+      json (~> 1.5.1)
       log4r (~> 1.1.9)
       net-scp (~> 1.0.4)
       net-ssh (~> 2.2.2)
+    vagrant (1.0.7)
 
 PLATFORMS
   java

models/vagrant_wrapper.rb

@@ -47,14 +47,14 @@ module Vagrant
         return build.workspace.to_s
       end
 
-      return File.expand_path(File.join(build.workspace.to_s, @vagrantfile))
+      return FilePath.join(build.workspace.to_s, @vagrantfile)
     end
 
     # Called some time before the build is to start.
     def setup(build, launcher, listener)
       path = path_to_vagrantfile(build)
 
-      unless File.exists? File.join(path, 'Vagrantfile')
+      unless FilePath.exists? FilePath.join(path, 'Vagrantfile')
         listener.info("There is no Vagrantfile in your workspace!")
         listener.info("We looked in: #{path}")
         build.native.setResult(Java.hudson.model.Result::NOT_BUILT)