Remove .DS_Store and .idea from .gitignore (intercom#325)

* Remove .DS_Store and .idea from .gitignore

This is considered a best practice

* Remove more entries

Co-authored-by: Gabriel Anca Corral <[email protected]>

Author: OskarStark

.gitignore

@@ -1,18 +1,6 @@
-# OSX
-.DS_Store
-
-# PhpStorm
-/.idea
-
-# Composer
 /vendor
 composer.lock
-composer.phar
 
 # PHPUnit
 phpunit.phar
 phpunit.xml
-
-# Extras
-/build
-*.swp