[.travis.yml][phpcs.xml] Introduce TravisCI + PHP_CodeSniffer

.travis.yml

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+language: php
+php:
+  - '5.4'
+  - '5.5'
+  - '5.6'
+  - '7.0'
+  - hhvm
+  - nightly
+
+install:
+  - pear install PHP_CodeSniffer
+
+script:
+  - phpenv rehash
+  - phpcs . --standard=phpcs.xml --warning-severity=0 --extensions=php -p

phpcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="RSS-Bridge Ruleset">
+  <description>Created with the PHP Coding Standard Generator. http://edorian.github.com/php-coding-standard-generator/</description>
+  <exclude-pattern>./bridges</exclude-pattern>
+  <exclude-pattern>./css</exclude-pattern>
+  <exclude-pattern>./vendor</exclude-pattern>
+  <rule ref="Generic.Classes.DuplicateClassName"/>
+  <rule ref="Generic.CodeAnalysis.EmptyStatement"/>
+  <rule ref="Generic.CodeAnalysis.UnconditionalIfStatement"/>
+  <rule ref="Generic.CodeAnalysis.UnnecessaryFinalModifier"/>
+  <rule ref="Generic.CodeAnalysis.UselessOverridingMethod"/>
+  <rule ref="Generic.Files.LineLength">
+    <properties>
+      <property name="lineLimit" value="80"/>
+      <property name="absoluteLineLimit" value="120"/>
+    </properties>
+  </rule>
+  <rule ref="Generic.NamingConventions.UpperCaseConstantName"/>
+  <rule ref="Generic.PHP.LowerCaseConstant"/>
+  <rule ref="Generic.Strings.UnnecessaryStringConcat"/>
+  <rule ref="Generic.WhiteSpace.DisallowTabIndent"/>
+  <rule ref="Generic.WhiteSpace.ScopeIndent">
+    <properties>
+      <property name="indent" value="2"/>
+    </properties>
+  </rule>
+  <rule ref="PEAR.Functions.FunctionCallSignature">
+    <properties>
+      <property name="indent" value="2"/>
+    </properties>
+  </rule>
+  <rule ref="PEAR.Functions.ValidDefaultValue"/>
+  <rule ref="PEAR.NamingConventions.ValidClassName"/>
+  <rule ref="PEAR.WhiteSpace.ObjectOperatorIndent">
+    <properties>
+      <property name="indent" value="2"/>
+    </properties>
+  </rule>
+  <rule ref="PEAR.WhiteSpace.ScopeClosingBrace">
+    <properties>
+      <property name="indent" value="2"/>
+    </properties>
+  </rule>
+  <rule ref="PSR2.ControlStructures.ElseIfDeclaration"/>
+  <rule ref="PSR2.ControlStructures.SwitchDeclaration">
+    <properties>
+      <property name="indent" value="2"/>
+    </properties>
+  </rule>
+  <rule ref="PSR2.Files.EndFileNewline"/>
+  <rule ref="Squiz.WhiteSpace.CastSpacing"/>
+  <rule ref="Squiz.WhiteSpace.ObjectOperatorSpacing"/>
+  <rule ref="Squiz.WhiteSpace.OperatorSpacing"/>
+  <rule ref="Squiz.WhiteSpace.SemicolonSpacing"/>
+  <rule ref="Squiz.WhiteSpace.SuperfluousWhitespace"/>
+</ruleset>