Add a gitattributes and optimize gitignore (#264)

.gitattributes

@@ -0,0 +1,8 @@
+/.github export-ignore
+/spec export-ignore
+/Tests export-ignore
+/.gitignore export-ignore
+/CHANGELOG.md export-ignore
+/phpspec.yml export-ignore
+/phpunit.xml.dist export-ignore
+/README.md export-ignore

.gitignore

@@ -1,87 +1,7 @@
-/app/bootstrap.php.cache
-/app/cache/*
-!app/cache/.gitkeep
-/app/config/parameters.yml
-/app/logs/*
-!app/logs/.gitkeep
-/app/phpunit.xml
 /bin/
-/composer.phar
 /vendor/
-/web/bundles/
 composer.lock
-
-/coverage/*
-clover.xml
-coverage.xml
-
-# -- Editores -----------------------------------------
-# vim
-.*.sw[a-z]
-*.un~
-Session.vim
-.netrwhist
-
-# eclipse
-*.pydevproject
-.project
-.metadata
-bin/**
-tmp/**
-tmp/**/*
-*.tmp
-*.bak
-*.swp
-*~.nib
-local.properties
-.classpath
-.settings/
-.loadpath
-.externalToolBuilders/
-*.launch
-.buildpath
-
-# phpstorm
-.idea/
-
-# textmate
-*.tmproj
-*.tmproject
-tmtags
-
-# sublimetext
-/*.sublime-project
-*.sublime-workspace
-
-# netbeans
-nbproject/private/
-build/
-nbbuild/
-dist/
-nbdist/
-nbactions.xml
-nb-configuration.xml
-
-# -- Sistemas Operativos ------------------------------
-# Windows
-Thumbs.db
-ehthumbs.db
-Desktop.ini
-$RECYCLE.BIN/
-
-# Linux
-.*
-!.bowerrc
-!.github
-!.gitignore
-!.htaccess
-*~
-
-# Mac OS X
-.DS_Store
-.AppleDouble
-.LSOverride
-Icon
-._*
-.Spotlight-V100
-.Trashes
+.phpunit.result.cache
+/phpunit.xml
+/coverage.xml
+/coverage/