Travis: new JRuby, develop on 2.4.0 (#476)

* Travis: new JRuby, develop on 2.4.0
* CircleCI: ensure new rubygems
* Rubocop: RegexpMatch too edgy; long blocks OK in specs
* Travis: JRuby head fails bundle install
* Travis: Allow failures for jruby-head

.rubocop.yml

@@ -10,6 +10,9 @@ AllCops:
 Metrics/LineLength:
   Enabled: false
 
+Performance/RegexpMatch:
+  Enabled: false
+
 #http://viget.com/extend/just-use-double-quoted-ruby-strings
 Style/StringLiterals:
   EnforcedStyle: double_quotes
@@ -67,3 +70,7 @@ Style/NumericPredicate:
 
 Style/SafeNavigation:
   Enabled: false
+
+Metrics/BlockLength:
+  Exclude:
+    - 'spec/**/*'

.ruby-version

@@ -1 +1 @@
-2.3.1
+2.4.0

.travis.yml

@@ -16,7 +16,7 @@ matrix:
     - rvm: 2.1
     - rvm: 2.3.3
     - rvm: 2.4.0
-    - rvm: jruby-9.1.6.0
+    - rvm: jruby-9.1.7.0
       jdk: oraclejdk8
       env:
         - JRUBY_OPTS=--debug
@@ -24,6 +24,9 @@ matrix:
       jdk: oraclejdk8
       env:
         - JRUBY_OPTS=--debug
+        - DEBUG=1
+  allow_failures:
+    - rvm: jruby-head
 
 addons:
   code_climate:

circle.yml

@@ -1,3 +1,6 @@
+dependencies:
+  pre:
+    - gem update --system
 notify:
   webhooks:
     # A list of hook hashes, containing the url field