Remove unnecessary travis builds in favor of using Evergreen

Author: estolfo

.travis.yml

@@ -4,18 +4,12 @@ sudo: false
 
 rvm:
   - 1.9.3
-  - 2.0.0
-  - 2.1.10
-  - 2.2.7
-  - 2.3.4
   - 2.4.2
   - ruby-head
   - jruby-19mode
   - jruby-9.1.12.0
-  - jruby-head
 
 jdk:
-  - oraclejdk7
   - openjdk7
   - oraclejdk8
 
@@ -29,7 +23,6 @@ env:
     - CI="travis"
     - JRUBY_OPTS="--server -J-Xms512m -J-Xmx1024m"
   matrix:
-    - MONGODB=2.4.14
     - MONGODB=2.6.12
     - MONGODB=3.0.12
     - MONGODB=3.2.11
@@ -51,33 +44,15 @@ branches:
   only:
     - master
     - 1.x-stable
-    - 2.3-stable
 
 matrix:
   allow_failures:
     - rvm: ruby-head
-    - rvm: jruby-head
   exclude:
     - rvm: 1.9.3
       jdk: openjdk7
     - rvm: 1.9.3
       jdk: oraclejdk8
-    - rvm: 2.0.0
-      jdk: openjdk7
-    - rvm: 2.0.0
-      jdk: oraclejdk8
-    - rvm: 2.1.10
-      jdk: openjdk7
-    - rvm: 2.1.10
-      jdk: oraclejdk8
-    - rvm: 2.2.7
-      jdk: openjdk7
-    - rvm: 2.2.7
-      jdk: oraclejdk8
-    - rvm: 2.3.4
-      jdk: openjdk7
-    - rvm: 2.3.4
-      jdk: oraclejdk8
     - rvm: 2.4.2
       jdk: openjdk7
     - rvm: 2.4.2