Add continuous integration

This is a basic file to add continuous integration to the project

.travis.yml

+language: php
+php:
+  - 5.3.3
+  - 5.4
+  - 5.5
+
+before_script:
+  ## PHP_CodeSniffer
+  - pear install pear/PHP_CodeSniffer
+  - phpenv rehash
+  ## PHP Copy/Paste Detector
+  - curl -o phpcpd.phar https://phar.phpunit.de/phpcpd.phar
+  ## PHP Mess Detector
+  - pear config-set preferred_state beta
+  - printf "\n" | pecl install imagick
+  - pear channel-discover pear.phpmd.org
+  - pear channel-discover pear.pdepend.org
+  - pear install --alldeps phpmd/PHP_PMD
+  - phpenv rehash
+  ## PHPLOC
+  - curl -o phploc.phar https://phar.phpunit.de/phploc.phar
+
+script:
+  ## PHP_CodeSniffer
+  - phpcs --report=emacs --standard=PSR1 .
+  - phpcs --report=emacs --standard=PSR2 .
+  ## PHP Copy/Paste Detector
+  - php phpcpd.phar --verbose .
+  ## PHP Mess Detector
+  - phpmd . text cleancode
+  - phpmd . text codesize
+  - phpmd . text controversial
+  - phpmd . text design
+  - phpmd . text naming
+  - phpmd . text unusedcode
+  ## PHPLOC
+  - php phploc.phar .
+  ## PHPUNIT
+  - phpunit .