(PDOC-223) prepare travis for dropping old version support

This gets rid of test cells for old versions of ruby (< 2.1.9) and old versions of puppet (< 4) and also updates the test command to run all 100+ unit tests instead of a whopping 27 that rake spec runs

.travis.yml

@@ -14,17 +14,13 @@ before_install:
 matrix:
   fast_finish: true
   include:
-  - rvm: 1.9.3
-    env: PUPPET_GEM_VERSION="~> 3" CHECK=spec
-  - rvm: 2.0.0
-    env: PUPPET_GEM_VERSION="~> 3" CHECK=spec
-  - rvm: 2.1.9
-    env: PUPPET_GEM_VERSION="~> 3" CHECK=spec
   - rvm: 2.1.9
     env: PUPPET_GEM_VERSION="~> 4" CHECK=spec
+  - rvm: 2.4.1
+    env: PUPPET_GEM_VERSION="~> 4" CHECK=spec
   - rvm: 2.4.1
     env: PUPPET_GEM_VERSION="~> 5" CHECK=spec
   - rvm: 2.1.9
     env: PUPPET_GEM_VERSION="~> 4" CHECK=rubocop
 
-script: 'SPEC_OPTS="--format documentation" COVERAGE="yes" bundle exec rake $CHECK'
+script: 'SPEC_OPTS="--format documentation" COVERAGE="yes" bundle exec rspec spec/unit/puppet-strings/*/*'

spec/unit/puppet-strings/yard/handlers/puppet/class_handler_spec.rb

@@ -19,7 +19,7 @@ describe PuppetStrings::Yard::Handlers::Puppet::ClassHandler do
     let(:source) { 'class foo{' }
 
     it 'should log an error' do
-      expect{ subject }.to output(/\[error\]: Failed to parse \(stdin\): Syntax error at end of file/).to_stdout_from_any_process
+      expect{ subject }.to output(/\[error\]: Failed to parse \(stdin\): Syntax error at end of input/).to_stdout_from_any_process
       expect(subject.empty?).to eq(true)
     end
   end

spec/unit/puppet-strings/yard/handlers/puppet/defined_type_handler_spec.rb

@@ -19,7 +19,7 @@ describe PuppetStrings::Yard::Handlers::Puppet::DefinedTypeHandler do
     let(:source) { 'define foo{' }
 
     it 'should log an error' do
-      expect{ subject }.to output(/\[error\]: Failed to parse \(stdin\): Syntax error at end of file/).to_stdout_from_any_process
+      expect{ subject }.to output(/\[error\]: Failed to parse \(stdin\): Syntax error at end of input/).to_stdout_from_any_process
       expect(subject.empty?).to eq(true)
     end
   end

spec/unit/puppet-strings/yard/parsers/puppet/parser_spec.rb

@@ -29,7 +29,7 @@ SOURCE
     }
 
     it 'should raise an exception' do
-      expect{ subject.parse }.to output(/\[error\]: Failed to parse test.pp: Syntax error at end of file/).to_stdout_from_any_process
+      expect{ subject.parse }.to output(/\[error\]: Failed to parse test.pp: Syntax error at end of input/).to_stdout_from_any_process
     end
   end