adds travis-ci to test against version 2 and 3 of the redis gem

Author: langalex

.travis.yml

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+language: ruby
+rvm:
+  - 1.9.3
+gemfile:
+  - Gemfile-redis2
+  - Gemfile-redis3
+before_script: "sudo apt-get install -qq redis"

Gemfile-redis2

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in redis-lock.gemspec
+gemspec
+
+gem 'redis', '~>2.0'
+gem "simplecov", require: false
+gem 'rspec'
+gem 'rake'

Gemfile-redis2.lock

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+PATH
+  remote: .
+  specs:
+    mlanett-redis-lock (0.1.1)
+      redis
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.1.3)
+    multi_json (1.3.6)
+    rake (0.9.2.2)
+    redis (2.2.2)
+    rspec (2.11.0)
+      rspec-core (~> 2.11.0)
+      rspec-expectations (~> 2.11.0)
+      rspec-mocks (~> 2.11.0)
+    rspec-core (2.11.1)
+    rspec-expectations (2.11.2)
+      diff-lcs (~> 1.1.3)
+    rspec-mocks (2.11.2)
+    simplecov (0.6.4)
+      multi_json (~> 1.0)
+      simplecov-html (~> 0.5.3)
+    simplecov-html (0.5.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  mlanett-redis-lock!
+  rake
+  redis (~> 2.0)
+  rspec
+  simplecov

Gemfile-redis3

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in redis-lock.gemspec
+gemspec
+
+gem 'redis', '~>3.0'
+gem 'rake'
+gem "simplecov", require: false
+gem 'rspec'

Gemfile-redis3.lock

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+PATH
+  remote: .
+  specs:
+    mlanett-redis-lock (0.1.1)
+      redis
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.1.3)
+    multi_json (1.3.6)
+    rake (0.9.2.2)
+    redis (3.0.1)
+    rspec (2.11.0)
+      rspec-core (~> 2.11.0)
+      rspec-expectations (~> 2.11.0)
+      rspec-mocks (~> 2.11.0)
+    rspec-core (2.11.1)
+    rspec-expectations (2.11.2)
+      diff-lcs (~> 1.1.3)
+    rspec-mocks (2.11.2)
+    simplecov (0.6.4)
+      multi_json (~> 1.0)
+      simplecov-html (~> 0.5.3)
+    simplecov-html (0.5.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  mlanett-redis-lock!
+  rake
+  redis (~> 3.0)
+  rspec
+  simplecov