Fix identation on composer.json
Merge pull request #4 from malukenho/patch-1

Fix identation on composer.json
Add PHP 5.5 to Travis config
Adds tests for filesystem classes.
Using vfs in test of File:copy and adding some tests for FTPClient.
Fixing File::copy using stream tests.
Modify tests to use vfsStream and fix code style issues.
Remove ftp client tests and stub.
Fix filename valriable not found error.