Removing java test + adding bundler cache

Author: ondrejfuhrer

.travis.yml

@@ -22,8 +22,5 @@ script:
   - brew cu pin java
   - brew cu pinned
   - brew cu -y --no-brew-update
-  - java --version > java.test.out && cat java.test.out | grep -q 13.
-  - rm -f java.test.out
   - brew cu unpin java
   - brew cu -y --no-brew-update
-  - java --version > test && cat test | grep -q 14.

lib/bcu/options.rb

@@ -171,7 +171,6 @@ def self.create_default_options
   end
 
   def self.create_default_config_file(config_filename)
-    File.unlink config_filename
     system "touch #{config_filename}"
     File.open(config_filename, "w") do |f|
       f.write default_config_hash.to_yaml